The fourth edition continues to provide psychologists with a fresh and engaging approach to the field of psychology of adult development and aging. It focuses on three themes: a multidisciplinary approach, positive images of aging, and the newest and most relevant research. Recent articles and updates to the information on demography, economics, and public policy are presented. The "Aging in the News" feature includes a story of a remarkable achievement by a middle-aged or older adult. The "Assess Yourself" boxes are also updated with new questions. Psychologists appreciate this mix of examples and discussions that make the material come to life.