How can individuals regulate their own development to live happy, healthy, and productive lives? Major theories of developmental regulation across the life span have been proposed (e.g., dual-process model of assimilation and accommodation; motivational theory of life-span development; model of selection, optimization, and compensation), but they have rarely been integrated. We provide an integration of key processes and predictions postulated by the 3 theories. Moreover, we present evidence from 2 age-heterogeneous, cross-sectional studies showing that the different processes of developmental regulation proposed by the different theories center around 3 key processes (i.e., goal engagement, goal disengagement, and metaregulation), which are positively associated with age and well-being. We conclude by proposing an agenda for future research. (Contains 2 tables, 1 figure, and 2 footnotes.)