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This commentary reinforces a central commitment of life course research: to make visible how social change matters in human lives. This paper captures a moderated conversation with four senior scholars about how they came to study the intersection between social change and life experience, why this intersection is so important to life course studies, and theoretical and methodological imperatives and challenges that come with it.

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This paper investigates the link between adolescent family structure and the likelihood of military enlistment in young adulthood, as compared to alternative post-high school activities. We use data from the National Longitudinal Study of Adolescent Health and multinomial logistic regression analyses to compare the odds of military enlistment with college attendance or labor force involvement. We find that alternative family structures predict enlistment relative to college attendance. Living in a single-parent household during adolescence increased odds of military enlistment, but the effect is accounted for by socioeconomic status and early feelings of social isolation. Living with a stepparent or with neither biological parent more than doubles the odds of enlistment, independent of socioeconomic status, characteristics of parent-child relationships, or feelings of social isolation. Although college attendance is widely promoted as a valued post-high school activity, military service may offer a route to independence and a greater sense of belonging.

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The U.S. Armed Forces offer educational and training benefits as incentives for service. This study investigates the influence of status configurations on military enlistment and their link to greater educational opportunity. Three statuses (socioeconomic status of origin, cognitive ability and academic performance) have particular relevance for life course options. We hypothesize that young men with inconsistent statuses are more likely to enlist than men with consistent status profiles, and that military service improves access to college for certain configurations. Analyses of the National Longitudinal Study of Adolescent Health (Add Health) show (1. that several status configurations markedly increased the likelihood of military enlistment and (2. within status configurations, recruits were generally more likely to enroll in higher education than nonveterans, with associate degrees being more likely.

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This study investigates the relation of young adult identities (ages 18-22 years), reflecting subjective age and psychosocial maturity, to educational and career attainment in young adulthood (ages 25-29 years). Add Health data show that having an older subjective age alone does not curtail attainment; the critical issue is the level of psychosocial maturity that accompanies subjective age. Those with older subjective ages and low psychosocial maturation have the lowest attainment at ages 25-29 years, while those with older subjective ages and high psychosocial maturation show considerable progress toward work-related attainment. For those with younger subjective ages, a lower level of psychosocial maturity is not as detrimental to attainment.

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Using data on veterans from the longitudinal Harvard Study of Adult Development (N=241), we focused on subjective aspects of military service. We examined how veterans of World War II appraised specific dimensions of military service directly after the war and over 40 years later, as well as the role of military service in their life course. In addition to examining change in appraisals, we examined how postwar appraisals of service mediated the effects of objective aspects of service, and how postwar psychological adjustment and health mediated the effects of postwar appraisals, on later-life appraisals. Men's appraisals at both time points were generally, but not highly, positive, and revealed remarkable consistency over four decades. Postwar appraisals strongly predicted later-life appraisals and mediated the effects of objective service variables. The effects of postwar appraisals were not carried forward through psychological adjustment or midlife health. Better adjustment, however, was negatively related to later-life appraisals. Results reinforce the idea that how men perceive their military experiences may be more important in predicting outcomes than the experiences themselves. Results are discussed in light of the sample characteristics, the historical context of World War II, and the complexities of appraisal and retrospection.

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In the National Longitudinal Study of Adolescent Health, a US longitudinal study of >15 000 young adults, we examined the extent to which socioeconomic status is linked to systolic blood pressure (SBP) and whether biobehavioral risk factors mediate the association. More than 62% of the participants had SBP >120 mm Hg and 12% had SBP >140 mm Hg. More than 66% were classified as at least overweight (body mass index >25 kg/m(2)), with >36% meeting criteria for at least class I obesity (body mass index >30 kg/m(2)). Multivariate models showed that higher household income and being married were independently associated with lower SBP. Higher body mass index, greater waist circumference, smoking, and higher alcohol intake were each independently associated with higher SBP. Meditational analyses suggested that higher education level was associated with lower SBP by way of lower body mass, smaller waist circumference, and lower resting heart rate. When these indirect effects were accounted for, education was not significantly associated with SBP. In contrast, household income remained associated with SBP even with control for all of the covariates. Results reinforce current public health concerns about rates of obesity and high blood pressure among young adults and suggest that disparities in education level and household income may play an important role in the observed decrements in health. Identifying modifiable mechanisms that link socioeconomic status to SBP using data from a large representative sample may improve risk stratification and guide the development of effective interventions.

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Developmental and life course studies of young adult identities have focused on 2 dimensions: subjective age and psychosocial maturity. This study examines the developmental synchrony of these 2 processes. In a longitudinal sample of young adults from Add Health (ages 18-22), a person-centered analysis of indicators of these dimensions identified 4 identity profiles. Two depict early and late patterns of identity; the others represent contrasting types of discordance: pseudo-adult, with subjective age more advanced than maturation level, and anticipatory, with subjective age less advanced than maturational level. The profiles vary by gender, socioeconomic status, and race-ethnicity, as well as by adolescent (ages 12-16) pubertal maturation, psychosocial adjustment, and family context. These results provide support for a more holistic, interdisciplinary understanding of adult identity and show that young adult identities in the Add Health sample follow differentiated paths into the adult years, with largely unknown consequences for the subsequent life course.

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In this essay, we argue that viewing adolescence within the full life course will improve our understanding of both adolescence itself and the life course more generally. Such an approach makes explicit how adolescence is linked to developmental processes in the years both before and after adolescence in ways that are shaped by broader patterns of social change. We highlight insights from research over the past decade that illustrate the kinds of life course questions about adolescence that need to be posed in the next decade, focusing on connections between adolescence and the two life stages that border it: childhood and young adulthood. Although life course themes cut across the many different topics that adolescence scholars typically study, we draw our examples from three specific substantive areas-educational success, puberty, and problem behavior.

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Children from alternative households complete fewer years of schooling. Yet little is known about the implications of coresidence with grandparents for educational attainment. Using data from the National Longitudinal Study of Adolescent Health (N = 10,083), this study found that extended households with two biological parents were not detrimental to high school completion or college enrollment. Although coresidence with grandparents did not compensate for not living with two biological parents, it seemed to be beneficial for the educational attainment of youth from single-mother households. In contrast, skipped-generation households were associated with a persistent disadvantage for educational attainment. Limited socioeconomic resources partially accounted for the adverse effects of alternative households, whereas parenting quality did not explain these effects. Interactions of gender by household structure suggested that stepfather households could have negative consequences for high school completion and college enrollment only for girls.

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PURPOSE: To assess the long-term association of military combat stress with coronary heart disease (CHD) and ischemic stroke (IS). METHODS: The association between exposure to military combat and the occurrence of CHD and IS was assessed among 5,347 men in the Atherosclerosis Risk in Communities (ARIC) study. Outcomes were assessed an average of 36 years after entry into military service during the eras of World War II, the Korean War, and the Vietnam conflict. RESULTS: Veterans were more likely to be older, white, and of higher socioeconomic status than non-veterans. No differences in CHD period prevalence rates were noted among the three exposure groups, overall or by era of service. Associations between combat and ischemic stroke period prevalence may be modified by father's education, although confidence intervals were wide and event rates small. CONCLUSIONS: Overall, middle-aged veterans with distant combat exposure are not at increased cardiovascular risk compared to those without combat exposure.

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BACKGROUND: Studies of the cardiovascular consequences of combat stress are few and inconclusive. OBJECTIVE: The association between combat exposure and subclinical atherosclerosis at Atherosclerosis Risk in Communities (ARIC) Study visits 1 (1987-1989) and 2 (1990-1992) was assessed among 5347 men from four U.S. communities. METHODS: Measured an average of 36 years after military entry, carotid intima-media thickness (CIMT) and carotid plaque among non-combat veterans (n=2127) were compared with non-veterans (n=2042) and veterans reporting combat experience (n=1178). RESULTS: Compared to non-combat veterans, non-veterans (risk difference (RD): 10.61; 95% confidence interval (CI): 0.81, 20.41) and combat veterans (RD: 12.79; 95% CI: 0.72, 24.86) had higher age-adjusted mean CIMT. Differences remained for combat veterans after adjustment for race, father's education and age at service entry but not years of service and for non-veterans after adjustment for race but not father's education. No differences in carotid plaque were noted. CONCLUSION: Results do not suggest that combat has a long-term detrimental effect on subclinical atherosclerosis among men.

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OBJECTIVES: The present study investigates the role of a disadvantaged background, the lack of social connectedness, and behavioral problems in channeling young men to the opportunities of the all-volunteer military instead of to college and the labor market. METHODS: Data from three waves of the National Longitudinal Study of Adolescent Health in the United States. The analytic sample consists of 6,938 white, black, and other males. RESULTS: The greatest likelihood of military service versus college and the labor force occurs when young men of at least modest ability come from disadvantaged circumstances, experience minimal connectedness to others, and report a history of adolescent fighting. DISCUSSION: Findings suggest the importance of access to post-high school education and worklife opportunities as a military service incentive for less advantaged young men in the all volunteer era.

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This study revisited the old research question of whether or not maternal employment would adversely affect children's development. We reframed the question by asking how a mother's temporal employment demands might be linked to child development. We used longitudinal data from a sample of 340 white, lower- to middle-class, dual-earner families living in the rural Midwest of the United States. The data were obtained from questionnaires and videotaped observations, and were informed by the mother, the father, the adolescent child, and a trained observer. As predicted, we found a strong relationship between a mother's temporal employment demands and work-family conflict, which was significantly associated with her emotional distress. A husband's egalitarian gender ideology was found to reduce the mother's emotional distress. Maternal distress was then negatively associated with nurturant and involved parenting, which in turn predicted a reduction in the adolescent child's emotional and behavioral problems over time.

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Previous research into the social distribution of early life depression has yielded inconsistent results regarding subgroup differences in depression levels and in the etiology of these differences. Using latent curve models and data from the National Longitudinal Study of Adolescent Health, this study investigates gender and racial/ethnic disparities in early life depressive symptoms and the explanatory roles of stress and socioeconomic status (SES). Results show that females and minorities experience higher levels of depressive symptoms across early life compared to males and Whites. Further, childhood SES and stressful life events (SLEs) explain much of the disparity for Blacks and Hispanics. Finally, Blacks, Hispanics, and females show greater sensitivity to the effects of low childhood SES and, in the case of females, SLEs. Overall, this study provides new insight into gender and racial/ethnic differences in the course of early life depression and in the role of the stress process during this important developmental stage.

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Despite important connections between religion and military action throughout world history, scholars have seldom explored the association between religiosity and military enlistment. Using data from the National Longitudinal Study of Adolescent Health (Add Health), we used a person-oriented analysis to categorize young men according to patterns of adolescent religious involvement. Youth indentified as "highly religious evangelical" are more likely to enlist in the military compared to their "highly religious non-evangelical" and "non-religious" counterparts; however, these findings hold only for those young men without college experience. These findings are discussed along with study limitations and promising directions for future research.

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Using the life course cumulative advantage/disadvantage (CAD) perspective, this study examines the influence of early family SES on trajectories of depressive symptoms spanning from early adolescence to early adulthood, as well as variations in SES-based inequality in depressive symptoms trajectories over this period. This study looks at direct influences of family SES and SES-age interactions (exposure-dependent CAD mechanisms), as well as indirect influences through SES-linked youth experiences (path-dependent CAD mechanisms) to explain variations in SES-based inequality. Data was derived from the Add Health study- a national longitudinal survey of 14,000 adolescents. Results showed large and significant effects of early family SES and associated factors on depressive symptoms in early adolescence, but diminishing effects in middle and late adolescence, supporting the hypothesis of equalization in adolescent health across levels of SES. Disparities in depression reemerged as adolescents entered adulthood, supporting the view that SES-based health equalization is only a temporary process. These findings also strengthen the concept of life course CAD processes, stemming from family characteristics, coming into play later in life. Early family SES was directly and indirectly related to a set of transition-related risks and challenges during emerging adulthood, to which young adults from families of higher SES responded more effectively than those of lower SES. This paper discusses theoretical and methodological implications of the findings.

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Few studies have examined the impact that mentoring (i.e., developing a special relationship with a non-parental adult) has on educational achievement and attainment in the general population. In addition, prior research has yet to clarify the extent to which mentoring relationships reduce inequality by enabling disadvantaged youth to compensate for a lack of social resources or promote inequality by serving as a complementary resource for advantaged youth. Results from a nationally representative sample of youth show (1) a powerful net influence of mentors on the educational success of youth and (2) how social background, parental, peer, and personal resources condition the formation and effectiveness of mentoring relationships. The findings uncover an interesting paradox-that informal mentors may simultaneously represent compensatory and complementary resources. Youth with many resources are more likely than other young people to have mentors, but those with few resources are likely to benefit more from having a mentor-particularly teacher mentors-in their lives.

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OBJECTIVE: This longitudinal study of American veterans investigated the mortality risks of five World War II military experiences (i.e., combat exposure) and their variation among veterans in the post-war years. METHODS: The male subjects (N=854) are members of the Stanford-Terman study, and 38 percent served in World War II. Cox models (proportional hazards regressions) compared the relative mortality risk associated with each military experience. RESULTS: Overseas duty, service in the Pacific and exposure to combat significantly increased the mortality risks of veterans in the study. Individual differences in education, mental health in 1950, and age at entry into the military, as well as personality factors made no difference in these results. CONCLUSIONS: A gradient is observable such that active duty on the home front, followed by overseas duty, service in the Pacific, and combat exposure markedly increased the risk of relatively early mortality. Potential linking mechanisms include heavy drinking.

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Social context is increasingly recognized as essential for understanding complex human outcomes even among geneticists who focus on genetic influences. These outcomes typically involve multiple genes, multiple environmental factors, and the interactions between the two. In this paper, we propose a conceptual framework for gene-environment interaction and show how the interaction can be tested empirically using a sample of MZ twin, DZ twins, and full siblings. We test the hypothesis that the genetic contribution to adolescent drinking depends on the drinking behavior of their friends, using a sample of clusters of siblings and their friends from Add Health. Our analysis has yielded evidence supporting the gene-environment interaction hypothesis. High levels of alcohol use by one's best friend or among one's friends tend to bring about higher levels of genetic contribution to alcohol use. Lower levels of alcohol use by one's best friend or among one's friends tend to suppress the level of genetic contribution to alcohol use. Our findings suggest that friend behavior might be a particularly important environmental moderator of the expression of genetic disposition for adolescent drug use, smoking, dietary habits, and risky sexual behavior. Subsequent studies of these behaviors that use non-DNA twin samples or DNA measures of genetic variants should investigate peer influence as a significant environmental moderator.

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OBJECTIVES: This study investigated whether men's mental and physical health problems during the middle years may be attributed, in part, to the influence of varying levels of, and changes in, work control among members of a rural midwestern cohort. Specific study objectives were to examine (a) how trajectories of work control influence men's mental and physical health outcomes and (b) how this influence is mediated by the trajectories of personal control during the middle years. METHODS: The study used four waves of data on 318 employed men across 10 years of midlife. Variables included self-reported work control, personal control, and mental and physical health. RESULTS: The results supported the hypothesis that both the initial level and change in work control contribute to men's mental and physical health outcomes during the middle years. This influence was mediated by the initial level and change in personal control. DISCUSSION: Our results demonstrate the dynamic nature of work experiences, personal control beliefs, health, and long-term health consequences due to work conditions in a sample of middle-aged men. We discuss the theoretical implications of this.

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