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 challenging cultural definitions of strength, maturity, power, and sexiness. This is a chapter in life when the traditional norms, rules, and rituals of our careers seem less encompassing and restrictive; when many women and men seem to be embracing new challenges and searching for greater meaning in life.