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The German Ageing Survey (DEAS) is a cohort-sequential study which investigates nationwide representative samples of individuals in the second half of life. DEAS samples were drawn in 1996, 2002, 2008, and 2014 and were assessed up to five times (1996, 2002, 2008, 2011, and 2014). Due to the specific DEAS study design, individual developmental trajectories, cross-sectional cohort effects, as well as cohort trends in intraindividual changes can be investigated across a wide range of developmental key outcomes. The aim of this symposium is to present and integrate recent DEAS findings on historical trends in major developmental domains (health, well-being, social relationships, and self-perceptions of aging), with each finding based on a different statistical approach. Spuling and Wettstein combine and compare cross-sectional and longitudinal data to disentangle age and cohort effects in different dimensions of physical health. Wettstein and Spuling investigate cohort effects in trajectories of different aspects of well-being over a long-term period of up to 18 years. Huxhold examines the interaction of age and historical change on the maintenance of friendship relations up into old age. Finally, Wurm et al. analyze societal changes in self-perceptions of aging from 1996 to 2014 for different age groups. Findings of the four studies reveal that cohort trends are not necessarily positive across all developmental domains investigated. Moreover, cohort differences may interact with chronological age, with cohort effects varying in size across different adult age group. All four presentations will be discussed by R. A. Settersten, Jr.
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