I hike often with a guy that was 76 this summer and will be 77 when he finishes the Colorado Trail next summer.
His aerobic system is still very good. Recently he took one of the girls in his church youth group for a half century bike ride. He told me not to worry because she was a cross country star and could probably keep up. He said he only had to wait a couple of times for her.
However his vision and hearing are failing. A couple of years ago he did not hear a rattle snake buzzing him. His vision affects his balance and I am careful to keep him on good trails.
My desire is to go as long as I can, then have all my systems fail at the same time. Age is liberating. I am less competitive and judgemental. I still track my training times, but I do NOT share them with anyone.
Life is good. <img src="/forums/images/graemlins/grin.gif" alt="" />
"In theory, theory and practice are the same. In practice, they are not."