Read the book Younger Next Year , or Younger Next Year for Women: the authors talk about how continued activity--that is, doing regular exercise 6 days a week, for example, oh, I don't know, cycling maybe --can stave off not only arthritis but also some of the other effects of aging.

Both authors are huge fans of cycling as a sport that can carry us into our 50s, 60s, 70s, 80s.....