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Objectives: Previous studies have primarily focused on depression among older adults. Given that middle age links young adulthood to older adulthood and encompasses a variety of changes in roles and status, which influence depression, it is important to understand the changes of depression during this period. Methods: This study used data from the National Longitudinal Survey of Youth 1979. The final sample consisted of 834 individuals, and four points in time were used: 34, 36, 40, and 50 years of age. The Latent Growth Model (LGM) was used to estimate the trajectories of depression. Results: The trajectories of depression present a non-linear change, referring to V-shaped curve. The conditional model shows that there are significant individual differences on initial status. Males were negatively associated with the latent initial level of depression. Individuals who showed higher self-esteem and cognitive ability were negatively associated with the latent initial level of depression. In addition, health insurance was negatively associated with the latent initial levels of depression. Both employment and net worth predicted lower intercepts of depression. Discussion: As the 40s is a bridge between the lowest levels of depression and a gradual increase of depression, service providers should be aware of changes of depression among middle-aged adults and spend more time and resources to encourage those individuals to prepare for changes in depression. Prevention programs for depression and providing more opportunities for employment and education to save money should be more focused on young adults. [ABSTRACT FROM AUTHOR]

This study examines the trajectories of mental health across baby boomers to understand their mental health during middle age. This study used secondary data from the National Longitudinal Survey of Youth 1979 (NLSY79) and used four points in time to estimate trajectories of mental health during adulthood. This study included 834 participants who were born in 1959. The Latent Growth Curve Model (LGCM) was used for modeling and estimating the trajectories of mental health. The trajectories of mental health show non-linear change even after considering longitudinal changes of variables. The trajectories indicate a V-shaped curve: higher depression at 34 and 50 years of age and the lowest depression at 40 years. Males predicted lower intercepts of depression and those with higher self-esteem showed lower depression initially. This study provides further evidence for understanding baby boomers' mental health during their adulthood within a longitudinal setting by using a nationwide sample. More specialized interventions and services should be considered for females' mental health problems over time. It is also important to help individuals develop and cultivate their self-esteem before entering into middle age. [ABSTRACT FROM AUTHOR]