In an unprecedented series of studies, Harvard Medical School has followed 824 subjects--men and women, some rich, some poor--from their teens to old age. Harvard's George Vaillant now uses these studies, the most complete ever done anywhere in the world, and the subjects' individual histories to illustrate the factors involved in reaching a happy, healthy old age. He explains precisely why some people turn out to be more resilient than others, and how to live a more fulfilling, satisfying and rewarding life in the later years.