The Third Chapter: Passion, Risk, and Adventure in the 25 Years After 50

In the twenty-first century, a developmental phase of life is emerging as significant and distinct, capturing our interest, engaging our curiosity, and expanding our understanding of human potential and development. Demographers talk about this new chapter in life as characterized by people—between fifty and seventy-five—who are considered "neither young nor old." In our "third chapters" we are beginning to redefine our views about the casualties and opportunities of aging; we are challengi...