With all my recent emphasis on high mileage, I thought I might be scaring some people away. But I do a lot more exercise than is necessary because it is my hobby and I enjoy it. For people that may be a little less nuts about exercise than me, how much is enough for healthy aging? I think this is pretty much answered by the typical recommendations, which is about 150 minutes a week of moderate activity like walking or equivalent, or 75 minutes of more vigorous activity. I also think it is a good idea to keep up your and work on . If you find something you enjoy, more is fine.

And it is never too late to start as Patty Branch, who started exercising at 66, .