This volume comprehensively reviews the research on the psychology of the middle aged (ages 40-65). Topics include the concept of maturity and maturation models, the measurement and influences of adult self image; marriage and sexual patterns; intergenerational relationships between and children; vocations and avocations (work, retirement, play, and the factors influencing them), friendship and religious attitudes and patterns, medical and psychological research on the causes of aging and aging's impact on learning and behavioral patterns, the societal role of the aged in America and other nations, and adult attitudes toward death. A 931 item bibliography is appended. (DM)