Research consistently shows that personality development is a lifelong phenomenon, with mean-level and rank-order changes occurring in all life phases. What happens during specific life phases that can explain these developmental patterns? In the present paper, we review literature linking personality development in different phases of adulthood to developmental tasks associated with these phases. Building on previous work, we describe several categories of developmental tasks that are present in all phases of adulthood. However, the specific tasks within these categories change across adulthood from establishing new social roles in early adulthood to maintaining them in middle adulthood and preventing losses in old age. This trajectory is reflected in mean-level changes in personality, which indicates development towards greater maturity (increases in social dominance, conscientiousness, and emotional stability) in early and middle adulthood, but less so at the end of life. Importantly, developmental tasks are not only associated with mean-level changes, but the way in which people deal with these tasks is also related to rank-order changes in personality. We provide an outlook for future research on how the influence of historical time on the normativeness of developmental tasks might be reflected in personality development. Copyright © 2014 European Association of Personality Psychology Key words: personality development; developmental tasks; adulthood; old age Personality has consistently been found to change across the entire lifespan (e.g. Roberts & DelVecchio, 2000;Roberts, Walton, & Viechtbauer, 2006). This is reflected in several theoretical notions on personality development, which consider personality development as a lifelong phenomenon (Baltes, Lindenberger, & Staudinger, 2006;Fraley & Roberts, 2005;Lerner, 1984;Roberts, Wood, & Caspi, 2008). Previous research shows that lifelong personality development is affected by environmental influences, such as work experiences (Roberts, Caspi, & Moffitt, 2003) and social relationships (Neyer & Asendorpf, 2001). However, these studies commonly focus on one specific phase of adult life, leaving it unclear whether similar environmental influences play a role in triggering personality development across different life phases.The aim of the present paper is to describe sources of personality development across the adult lifespan 1 using developmental tasks as a framework. Developmental tasks are defined as age-graded normative tasks based on societal expectations about the developmental milestones that should be reached in specific life phases (Havighurst, 1972; also McCormick, Kuo, & Masten, 2011). We first provide a general overview of personality development across adult life and then introduce a new categorization of developmental tasks that might guide personality development across different life phases. Subsequently, we provide an overview of empirical research in different life phases (early, middle, and old adulthood 2 ). We then link personali...