Speaking of active nonagenarians, check out an article titled "Successful at 96, Writer Has More to Say" in today's New York Times. The piece profiles 96-year old Harry Bernstein who just published his first book: The Invisible Wall.
About his achievement, Mr. Bernstein says: “If I had not lived until I was 90, I would not have been able to write this book. . . It just could not have been done even when I was 10 years younger. I wasn’t ready."