“Roctogenarians: Late in Life Debuts, Comebacks, and Triumphs,” by CBS Sunday morning correspondent Mo Rocca, is a heartening anthology of individuals whose second acts are just as inspiring as their first. Rocca features artists, activists, architects, and athletes, and one actual rock star, Queen guitarist Brian May, who earned his PhD in astrophysics at age 60. The collection also includes cautionary tales about those who fell (some quite hard) from grace in the latter part of their lives. We see you Rudy Giuliani.