Journalist William J. Kole, reluctant but newly minted member of AARP, explores the looming era of super-agingâ€"incredibly longer lifespans overall, and eight times more centenarians by the year 2050â€"through the lens of past, present, and future life at ages 50, 65, 80, and on to 100-plus. What happens to all of us when 65 is merely a life half-lived?