I started riding in College (at about 24) and rode until about 30. Then I quit for about 6 years due to location and picked it back up again when I moved somewhere with more reasonable roads.
The last few years I did nothing buy cycling. I finally got sick of my gut and I just started going to the Gym again for the first time since I was in the Marines (before college). I ride about 75-150 miles a week and go to the gym 3 times a week. I take 2 days off a week.