I am 62 and started jogging in graduate school in my mid-twenties. I felt good enough in my mid-thirties to complete two NYC marathons and several shorter races. Now I do four-to-six combined run/walk routines on the tread mill per week, covering a little more than three miles per session at about an 11:45 pace. I also do 30-40 minutes a week of weight work and stretching. Had I not started out running all those years ago, there's no way I'd be able to do what I do now.

 | Runner Post- on NYT