This review of research on close relationships in old age is informed by principles of life span developmental psychology and life course theory in sociology. It begins with an elaboration of life span and life course concepts as applied to relationships and an analysis of the multiple forms that caring can take. The discussion continues with presentation of research on the effects of sociohistorical contexts on relationships in old age and studies of the effects of personal development and life events on relationships as well. A section examining problems in late-life close relationships is followed by examples of new directions for research on the intersections of personal development and close relationships.