As the human lifespan lengthens, a new developmental phase of life, characterized by people between the ages of 50 and 75, who are considered “neither young nor old,” is redefining society’s views on aging by challenging cultural definitions of strength, maturity, power, and sexiness. “Sara Lawrence-Lightfoot, one of our most graceful and gifted chroniclers of the changing psychological landscape, has produced a biography of the new lifestage emerging between the end of the middle years and the arrival of old age” (Marc Freedman, author, Encore: Finding Work That Matters in the Second Half of Life).