I started jogging in my early 30s, after I quit smoking. It was a good way to clear my lungs and keep the weight down. I knew someone who ran marathons and 6 miles almost daily, in his old age he was stricken with severe foot problems from it and had pain even walking. Now that I'm in my mid sixties, the most I do is brisk walking, and I take some kind of walk almost every day. Easier on the knees and feet for sure.