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Strict social isolation and physical distancing measures implemented during the COVID-19 pandemic had significant implications for the psychological well-being of middle-aged and older adults. This study aimed to investigate factors associated with depressive symptoms during the pandemic period among individuals who reported no significant depressive symptoms before the pandemic. Individuals from the Korean Longitudinal Study of Aging without a previous report of significant depressive symptoms across Waves 6 (2016) and 7 (2018) were investigated for the development of depressive symptoms in Wave 8 (2020). The multivariable logistic regression results revealed that both men and women who participated in social gatherings and physical exercise less than once a week were associated with an increase in the likelihood of depressive symptoms (odds ratio [OR] 2.88; 95% confidence interval [CI] 1.80-4.61 and OR 2.61; 95% CI 1.64-4.15, respectively for men and OR 2.58; 95% CI 1.80-3.70 and OR 1.51; 95% CI 1.02-2.23, respectively for women). In addition, unmarried men (OR 2.38; 95% CI 1.37-4.14) and women with one chronic disease (OR 1.98; 95% CI 1.14-3.43) or two or more chronic diseases (OR 2.28; 95% CI 1.31-3.99) reported a significant increase in the likelihood of depressive symptoms. Regular social gatherings and physical exercise were identified as key factors in mitigating depressive symptoms among middle-aged and older adults. The findings can inform the development of public health strategies that promote regular social interactions and physical activity to enhance the psychological resilience and overall well-being of middle-aged and older adults in the endemic era.

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Introduction: The aging population in South Korea faces numerous health challenges, one of which is the decline in Activities of Daily Living (ADL) and Instrumental Activities of Daily Living (IADL). This study aims to investigate the patterns of change in ADL and IADL among older adults and examines how these patterns vary between individuals with and without dementia. Methods: We conducted an analysis of data collected from the Korea Longitudinal Study of Ageing (KLoSA) between 2006 and 2022. Our cohort consisted of individuals aged 45 and older with non-dementia conditions, including mild cognitive impairment (N=6042), and a smaller group with dementia (N=91). Using Latent Growth Curve Models, we explored the developmental trajectories of ADL and IADL among our sample. Results: Our findings indicate a linear decline in both ADL and IADL scores as individuals age. The decline in IADL was more pronounced in the dementia group, suggesting a greater sensitivity to sociocultural factors within this domain. The data revealed that individuals with dementia had consistently lower ADL and IADL scores. Notably, the variance in scores within the dementia group increased with age, signifying a worsening in daily living performance and an increase in individual variation (F=226.630, p<.001). Discussion: The results of this study underscore the impact of dementia on both the self-regulation function and the social and cultural aspects of daily living performance, particularly reflected in IADL scores. These findings point to the necessity for comprehensive care strategies that address the multifaceted needs of older adults with dementia, including support for complex daily activities that are influenced by sociocultural factors.

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Drawing on data from two waves of the Korean Longitudinal Study of Ageing (2010 and 2018), this study examined how community-dwelling older men and women (65+) with functional limitations utilized formal and informal sources of care and how their patterns of care utilization changed over time. The usage patterns of formal and informal caregiving services were categorized into three groups: (a) informal help only, (b) formal-informal mix, and (c) no help from either. More men and women used both formal and informal help for their care needs in 2018 than in 2010 (15% compared to 7%). The proportion of older men who relied on informal help only remained similar across survey years, whereas a smaller proportion of older women relied on informal help only in 2018. Although formal care use has been expanded in South Korea, older men continue to utilize help from their families. However, for older women, the proportion who did not receive any help increased - despite an increase in formal care utilization. These findings highlight the importance of considering gendered resources in caregiving in Korea.

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Intergenerational contact is important to older adults' quality of life, but less is known about within-family differences in older parents' contact between sons and daughters, especially in countries with patrilineal traditions. Applying latent profile analysis to data on 3,228 Korean older adults' frequency of meeting and communication with each of their children, this study identified within-family patterns of intergenerational contact. Nearly half of parents exhibited gender-balanced patterns of meeting across children, while 13% reported "more frequent contact with daughters" and 39% reported "more frequent contact with sons." On the other hand, "equally high contact" (77%) was the most common pattern for communication. Multinomial regression results showed that the derived patterns were differentiated by parents' education, marital status, region, economic satisfaction, health, and depressive symptoms. The results highlighted the enduring nature of patrilineal traditions as well as the differing patterns of contact that Korean older adults have with their children.

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The purpose of this study is to investigate the association between social mobility and cognitive impairment among older adults in Korea. The study sample is drawn from nationally representative data, which comes from the 2016 Korean Longitudinal Study of Ageing (KLoSA). The final sample consists of 4264 KLoSA respondents aged 65 or older. Gender-specific logistic regression models are used to examine the association between social mobility and cognitive impairment. The results show that, when compared to the reference group (stable low social mobility), women in the downward and the stable high social mobility groups were less likely to have cognitive impairment. In contrast, upward social mobility was a protective factor for cognitive impairment only among men. Gender-specific interventions may be needed to enhance cognitive health among older Koreans. Further research is needed to examine the causal relations between social mobility and cognitive health between the genders.

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OBJECTIVES: This study aimed to investigate the effects of fear of falling (FOF) on cognitive decline in older adults in the Korean community, depending on the presence of accompanying depressive symptoms. METHODS: A total of 6263 individuals were included in the final analysis. Based on their baseline evaluation results for depressive symptoms and FOF, the subjects were divided into four groups: "normal control" (NC, n = 3783), "depression only" (Dep-only, n = 291), "fear of falling only" (FOF-only, n = 1755), and "depression with fear of falling" (Dep-FOF, n = 434). Cognitive decline was defined as a loss of more than three points in the K-MMSE score in participants with at least two years of follow-up. We examined the association between FOF accompanied by depressive symptoms and cognitive decline using a multivariate Cox proportional hazard model. RESULTS: Cognitive decline occurred in 76.3%, 68.5%, 63.9%, and 56.4% of the Dep-FOF, FOF-only, Dep-only, and NC groups, respectively. Our findings suggest that individuals with FOF do not always have cognitive decline (HR = 1.03, 95% CI = 0.95-1.12, P = 0.43) compared to individuals without FOF. Furthermore, depressive symptoms with FOF are associated with a higher risk of cognitive decline (HR = 1.23, 95% CI = 1.08-1.41, P = 0.002) in community-dwelling older adults in Korea. CONCLUSION: Healthcare providers should be attentive to community-dwelling older adults who experience both depressive symptoms and FOF because our findings suggest that this unique combination increases the risk of cognitive decline.

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Objectives: Geriatric oral health-related quality of life is a relatively new but rapidly growing concept as it is directly related to the general wellbeing and self-esteem of older adults. This study assessed the impact of worsening depression symptoms on oral health-related quality of life using representative nationwide data of Korean older adults. Methods: This study comprised a longitudinal sample of older adults aged ≥60 from the Korean Longitudinal Study of Aging (2016-2020). After applying the exclusion criteria, 3,286 participants were included in the study. Depression status was determined through the biennial assessment of the short-form Center for Epidemiologic Studies Depression Scale (CESD-10); oral health was measured using the Geriatric Oral Health Assessment Index (GOHAI). We employed the lagged general estimating equations to assess the temporal effect of the CESD-10 score change on the GOHAI score. Results: A decrease in CESD-10 score over a 2-year period was significantly associated with a decrease in GOHAI score in men and women: ß = -1.810 and ß = -1.278, respectively (p-values < 0.0001). Furthermore, compared to the same or improved CESD-10 score, worsening of the score on 1-2 points detected the ß = -1.793 in men and ß = -1.356 in women, and worsening on ≥3 points: ß = -3.614 in men and ß = -2.533 in women. Conclusions: This study found that depression exacerbation is negatively associated with oral health-related quality of life in later life. Further, a more significant worsening of depression symptoms was correlated with lower scores for oral health-related quality of life in our study population.

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Background: Social engagement serves as the foundation for social connections by providing a sense of belonging, social identity, and fulfillment. Previous studies have mainly focused on the one-way relationship between social engagement and subjective health among older individuals, and little attention has been paid to their mutual relationship. Therefore, this study aimed to examine the mutual association relationship between social engagement and their subjective health in older Koreans. Methods: Seven waves of data samples (aged ≥60 years) from 2006 to 2018 from the Korean Longitudinal Study of Aging (KLoSA) was used in this study. Descriptive analysis, chi-squared tests, 2-year lagged Generalized estimating equation (GEE) model, and cross-lagged panel model were performed to investigate the mutual association between social engagement and subjective health among six survey periods. Results: Results of the GEE model revealed when controlling for other variables, older Koreans who reported good subjective health only had a higher OR (1.678 vs. 1.650, p < 0.001) of participating in social engagement than those who had bad subjective health in 2006-2008 period; the occurrence rate of more social engagement was significantly higher among older adults with good subjective health than among those with bad subjective health (five out six survey periods). Cross-lagged analysis showed similar results that coefficients of social engagement on subjective were relatively larger in three survey periods; coefficients of subjective health on social engagement were relatively larger in the other three survey periods. The impact of social engagement on subjective health might be greater than that of subjective health on social engagement. Conclusion: All-around participation and engagement of older people in society have become a consensus among the international community. In view of the single social engagement activities and less relevant participation channels in Korea, government departments should consider not only regional but also local characteristics to create more social participation opportunities for older individuals.

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BACKGROUND: Due to the rapid growth of the older adult population, multimorbidity has become a global concern for an aging society. Multimorbidity has been associated with poor health outcomes, including low quality of life and a high risk of mortality, resulting in an overload of healthcare systems. However, multimorbidity incidence and its related factors are poorly understood among older adults. This study aimed to determine whether sociodemographic characteristics, lifestyle, and psychosocial factors predict multimorbidity incidence among older adults in Korea. METHODS: This longitudinal study used the Korean Longitudinal Study of Aging (KLoSA) dataset from 2008 to 2018. The KLoSA is a panel survey of nationally representative samples aimed at providing data for developing socioeconomic policies for the increasing aging population in Korea. The study sample included 1967 older adults aged 65 years and over who had none or one of the chronic diseases at the baseline in 2008. Multimorbidity incidence was defined as the co-existence of two or more chronic diseases among 12 doctor-diagnosed diseases based on self-reports. Cox's proportional hazards models were used to identify significant predictors of multimorbidity incidence over a 10-year follow-up period. RESULTS: Among 1967 respondents (female 54.5%, mean age 72.94), 625 (31.8%) incidents of multimorbidity were reported, contributing to 47.5 incidents per 1000 people after 10 years of follow-up. Low levels of social interaction, obesity, past smoking habits, and current or past drinking habits were identified as significant predictors of multimorbidity incidence among older adults in Korea. CONCLUSIONS: This study identified older adults at high risk for multimorbidity incidence. These groups require more attention from health care providers in the course of chronic disease monitoring and management. Specific interventions and health policies to promote social interaction and a healthy lifestyle are essential to delay multimorbidity incidence. This longitudinal approach will contribute to developing preventive strategies to reduce the incidence of multimorbidity among older adults.

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The purpose of this study is to investigate how contact care by adult children influences the effect of caring for grandchildren on depression in older adult individuals. Studies have shown that caring for grandchildren either increases or decreases the symptoms of depression in older adult individuals, while other studies have shown no effect. The reason for these inconsistent results is that the key control variable, contact care by adult children, has been omitted from these previous studies. An analysis of panel data consisting of observations from 162 older adult respondents in the Korean Longitudinal Study of Aging over the 2008-2016 period confirms that the positive effect of caring for grandchildren on depression in older adults increased as the number of adult children who visited their older adult parents after entrusting their children to them increased. As more of their adult children visited the older adult individuals, the latter were more likely to feel that caring for their grandchildren was healing rather than stressful.

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This study examined the effect of aging on gender-specific educational differences in the risk of cognitive impairment using a nationally representative sample of 4278 men and 5495 women aged 45 years and older from the dataset of the Korean Longitudinal Study of Aging. Sociodemographics, lifestyle, and medical conditions were included as covariates in the mixed logistic regression analysis models. The prevalence of cognitive impairment was higher in women than in men at baseline. The risk of cognitive impairment in each age group decreased with education in both men and women. The risk by educational rank was worse at lower levels and increased with age, more so for women than men. Aging appears to widen the impact of educational differences on the risk of cognitive impairment and is more unfavorable for women than for men. Public health policies regarding population aging need to consider this and identify the target population to reduce both the level of and the difference in the risk of cognitive impairment.

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This study aims to assess handgrip strength as a predictor of cognitive decline within men and women in Korea. A random-intercept logistic regression is fit to estimate the status changes in cognitive function throughout all rounds of the KLoSA, a nationally-representative survey of adults aged 45 years and older. Males in the highest quartile were 71.9% less likely to experience cognitive impairment than those in the lowest quartile. The odds of cognitive impairment for men in the third and second quartiles reduced by 62.6% and 60.4% respectively. Similarly, the odds of cognitive impairment for women declined as 72.7%, 63.0%, and 41.8% for fourth, third, and second quartile, respectively, compared with the lowest quartile. These results imply that assessing and monitoring handgrip strength may enable us to identify subgroups of the elderly with higher likelihood of cognitive impairment in Korea.

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BACKGROUND: In most of developed societies, the prevalence of informal care is on the rise due to rapid population ageing. This study investigates longitudinal associations between informal caregiving and health among caregivers and potential gender differences in this relationship. Moreover, drawing on the Health Promotion Model, this study examines the mediating role of health promoting behaviors in the link between informal caregiving and caregiver's health. METHODS: Seven waves of a large-scale (N = 9,608), a nationally representative longitudinal study of middle- and old-aged adults in Korea between 2006 and 2018, were used. To address the possibility of omitted variable bias, this study employed ordinary least squares models with lagged dependent variables (OLS-LDV) as well as fixed effects (FE) models. Univariate Sobel-Goodman mediation tests were used. RESULTS: Findings from OLS-LDV models showed that transition into informal caregiving is negatively associated with health satisfaction and self-rated health. FE results also suggest that our results are robust to controlling for unobserved heterogeneity. In the model where informal caregiving is interacted with gender, we found that these associations were largely driven by women caregivers. Results from Sobel-Goodman tests revealed that a decrease in regular exercise partially explains the observed association between informal caregiving and subjective health outcomes (11% for health satisfaction and 8% for self-rated health). CONCLUSIONS: Although informal caregiving can be a rewarding role, it poses a threat to caregiver's subjective health. Findings of this hold important implications and provide evidence in support of a gender-conscious approach to improve the health and well-being of informal caregivers.

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Accumulating research indicates that handgrip strength is associated with cognitive function. Studies have also shown the difference in cognitive decline between males and females. We investigated the association between baseline handgrip strength and later cognitive function in older adults according to sex using the dataset from Korean Longitudinal Study of Aging (2006-2018). Overall, 9707 observations of 1750 participants (989 males and 761 females) over 65 years of age were sampled from the first wave, followed by six consecutive waves. The Korean version of the Mini-Mental State Examination and baseline handgrip strength scores were assessed. Sociodemographic and health-related variables were also included as covariates in the multivariable linear mixed models. Males in the lowest quartile of the baseline handgrip strength decreased in cognitive function (ß = -0.54, standard error (SE) = 0.16, p < 0.001), compared to males in the highest quartile. For females, those in the second lowest quartile (ß = -0.65, SE = 0.19, p < 0.001) and the lowest quartile (ß = -0.53, SE = 0.19, p< 0.01) decreased in cognitive function. Handgrip strength may be positively associated with later cognitive function, but the association may be non-linear and differ between sexes. Sex-specific preventive assessment of handgrip strength may help identify older adults at risk for cognitive impairment.

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Objective: This study aimed to analyze the factors affecting depression among South Korean middle-aged and older adults using data from the Korean Longitudinal Study of Aging. Methods: We analyzed data regarding demographic characteristics, lifestyle, quality of life, cognitive level, and depression. Cognitive level and depression were evaluated using the Korean-Mini-Mental Status Examination and Center for Epidemiological Studies Depression Scale, respectively. Results: Depression was correlated with age, gender, residential area, level of education, alcohol intake, regular exercise, life satisfaction, and cognitive level, but not smoking. Furthermore, depression was highly affected by age, residential area, regular exercise, life satisfaction, and cognitive level, with a prediction accuracy of 80.26% achieved through machine learning analysis. Conclusions: Various factors are associated with depression in middle-aged and older adults. Therefore, multifaceted interventions for preventing depression in these age groups are required.

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BACKGROUND: The importance of SA (Successful aging) has been emphasized in recent years, with focus shifting towards attaining healthier aging rather than longevity. However, the influence of SA and its changes on mental health such as depression remains a relatively unexplored area in gerontology. Therefore, we investigated the longitudinal association between changes in SA and depressive symptoms in Korean older adults. METHODS: This study comprised a longitudinal sample of older adults aged ≥ 45 years, drawn from the Korean Longitudinal Study of Aging (2006-2018). Changes in SA status was determined using the Rowe and Kahn model over two consecutive years. Using an adjusted generalized estimating equation model, we examined the association between changes in successful aging status, namely SA and NSA (Non-successful aging), and depressive symptoms. RESULTS: Compared to the SA→SA group, depressive symptom risk in the NSA→NSA and SA→NSA groups were higher in men [(OR, 1.16; 95 % CI, 1.13-1.18), (OR, 1.11; 95 % CI, 1.08-1.13), respectively] and in women [(OR, 1.15; 95 % CI, 1.13-1.18), (OR, 1.11; 95 % CI, 1.09-1.14), respectively]. Subgroup analysis of the dimensions of successful aging revealed that low or worsening criteria of successful aging status in men and women were associated with depressive symptoms. CONCLUSIONS: Korean older adults who continuously failed to attain or maintain successful aging status had the highest risk of depressive symptoms. These results could further assist in establishing policies and interventions that promote successful aging and subsequently protect the mental health of the Korean older adult population.

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BACKGROUND: Recent studies have shown that long working hours can have adverse consequences on health and possibly trigger biological processes that mediate the relationship between long working hours and cognitive decline. OBJECTIVE: To investigate whether long working hours and the overall duration such exposure is associated with a decline in cognitive function. METHODS: Data obtained during the Korean Longitudinal Study on Aging (n = 2,518) during the period 2006-2018 were used to explore the relationship between long working hours and cognitive decline. Korean version of the Mini-Mental State Examination (K-MMSE) scores were used to evaluate cognitive function. Cox proportional hazard regression models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs), which were used to evaluate declines in K-MMSE scores over the 12-year study period. RESULTS: Overall HR (95% CI) for a decline in cognitive function in long working hours group was 1.13 (0.73-1.17). When categorized by sex, women with long working hours had an HR (95% CI) of 1.50 (1.05-2.22), K-MMSE scores decreased significantly after working long hours for 5 years (p < 0.01). CONCLUSION: The study furthers understanding of the effects of long working hours on cognitive decline among female workers. Further research is required to determine the effects of long working hours on cognitive functions.

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OBJECTIVES: Heterogeneity in successful aging has been found across countries. Yet, comparable evidence is sparse except in North America and Europe. Extending prior research, this study examined the prevalence and correlates of successful aging in East Asia: China, Korea, and Japan. METHOD: We used harmonized data sets from national surveys. A total of 6,479 participants (aged between 65 and 75) were analyzed. Using Rowe and Kahn's (1987, 1997) model, successful aging was defined as having no major diseases, no difficulty performing activities of daily living, obtaining a median or higher score on tests of cognitive function, and being actively engaged. RESULTS: The average prevalence of successful agers was 17.6%. There were variations in the global and specific measures of successful aging within and across countries, even after controlling for individual sociodemographic factors (age, gender, and education). The odds of aging successfully were highest in Japan and lowest in China, especially in the rural areas. Being younger and males were associated with a higher likelihood of successful agers in both global and specific measures. DISCUSSION: This study observed heterogeneity in successful aging in East Asia. To identify policy implications, future research should explore potential societal factors influencing individuals' opportunities for successful aging.

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OBJECTIVES: Geriatric depression complicates cognitive health in older adults. This study aims to investigate the impact of depressive symptoms on cognitive impairment in community-dwelling older adults, depending on whether cognitive dysfunction accompanied. DESIGN: A community-based longitudinal cohort study. SETTING: This study analyzed data from the Korean Longitudinal Study of Aging (KLoSA) from 2006 to 2018. PARTICIPANTS: Among 10,254 individuals who were registered in the KLoSA study, a total of 9119 subjects met the criteria, and 4547 subjects were included in the final analysis. The subjects were grouped into 4 categories based on depressive symptoms and cognitive dysfunction at baseline assessment: "normal control" (NC, n = 3341), "depression only" (Dep-only, n = 652), "cognitive dysfunction only" (CD-only, n = 393), and "depression with cognitive dysfunction" (Dep-CD, n = 161). MEASUREMENTS: Cognitive impairment 10 years later was defined as K-MMSE scores below two percentile on demographically adjusted norms. RESULTS: Ten-year survival, that is, not experiencing cognitive impairment, was 80 $$ \pm \,$$1% in NC group, 72 $$ \pm $$ 2% in Dep-only group, 52 $$ \pm $$ 3% in CD-only group, and 44 $$ \pm $$ 5% in Dep-CD group. The hazard ratio (HR) of the Dep-only group (HR = 1.18, 95% CI, 0.97-1.43, n.s.) did not differ from that of the NC group, but the HR of the Dep-CD group was significantly higher (HR = 2.85, 95% CI, 2.23-3.66, p < 0.001) than the NC group. When the Dep-CD group was compared to the CD-only group, the HR was 1.13 (95% CI, 0.85-1.49, n.s.), which indicates that it did not significantly differ from the CD-only group. CONCLUSIONS: Our findings suggest that depressive symptoms with cognitive dysfunction are associated with a higher risk of cognitive impairment. Furthermore, cognitive dysfunction occurring with depressive symptoms is as much a risk for cognitive impairment as is pure cognitive dysfunction. Thus, healthcare providers should pay close attention to the community-dwelling elderly when depressive symptoms occur with cognitive dysfunction.

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Despite substantial research on numerous aspects of health in the elderly, past studies that examined the association between handgrip strength and mortality have been conducted with samples drawn mostly from Caucasian populations, and little is known about whether similar trends are found in non-Western contexts such as Korea. The present study drew data from KLoSA (Korean Longitudinal Study of Aging), a nationally representative sample of middle-aged adults, and followed up for a decade. Results from discrete-time event history analysis of mortality indicated that higher handgrip strength significantly reduces the likelihood of death in both men and women. Men in the highest third of handgrip strength were 53.9% less likely to experience death than those in the lowest third. Women followed a similar pattern: middle and high handgrip strength reduced the odds by 26.4% and 48.3%, respectively. These findings suggest that handgrip strength has a significant impact on elderly mortality and does so in a negatively gradient manner.

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