IN MY FIVE CAREERS, ninety-four year old Joseph Taylor offers the keen observations of a trained professional, using plain everyday language, concerning how the centralities of work, marriage, friendships, music and skillful management of chance events, have contributed to retaining his intellectual acuity and to promoting longevity. He notes that his life-long pursuits coincide with contemporary research findings on maintaining brain power and achieving a long life. Taylor suggests many brain-boosting post-retirement activities, and offers insightful comments on the practice of psychiatry,...