I was a couch potato until 26 (mostly medical reasons) when I developed high blood pressure. I've been doing strenuous aerobics since then (44 years) and weight training for the last 30. The only negative I've had due to the ageing process is at a 67-68 I noticed it took significantly longer to recover than before.

All the parameters are excellent. I've started jogging again to complement the cycling and the weight training. I prefer mountain biking as it's more fun to me and certainly a much better work-out than road. I also love being in the woods and don't care that much for being on the road, especially on a hot day.

Al