Nir Barzilai: Is aging, as we know it, over?

The concept of healthspan - the number of years that we enjoy optimum health - has come a long way, in recent years. In fact, Dr. Nir Barzilai, founding director of the Institute for Aging Research at Albert Einstein College of Medicine, believes we are "ushering in a future where the norm will be for people to be healthy, active and mentally sharp, during the last quarter of their lives." In his new book, Age Later: Healthspan, Life Span, and the New Science of Longevity, h...