This study examines the resources and well-being of older widowed, divorced or separated, and never-married men and women over time. The first comprehensive, longitudinal study of its kind ever published, The Unmarried in Later Life considers the effects of changes in health, finances, work, social networks, vulnerability, and psychological well-being and compares adaptations to these transitions for unmarried men and women. What emerges is a clear view of the changes in social relationships and their patterns by marital status and gender over the course of a decade.