What's the secret to living into your 90s--and loving every minute of it? In this documentary, irrepressible writer-comedian Carl Reiner (who shows no signs of slowing down at 95) tracks down several celebrated nonagenarians, and a few others over 100, to show how the twilight years can truly be the happiest and most rewarding. Among those who share their insights into what it takes to be vital and productive in older age are Mel Brooks, Dick Van Dyke, Kirk Douglas, Norman Lear and Betty White. Other interviews include: Jerry Seinfeld, longevity expert Dan Buettner, and Van Dyke's much-younger wife Arlene.