Stopped riding when I was 14. Started again 18 months ago when I was 60. I have always enjoyed hiking and long walks. One day I decided to see if I could find an interesting and safe route to walk the 7 miles to my office. After my walk, I decided that biking to work would be easy and enjoyable. Bought a bike. Sold my car. (Full disclosure: My wife kept hers and lets me use it if I ask nicely.) Been a bike commuter and weekend distance rider ever since. Did my first century a week ago. Even when it's not so much fun, like when the wind chill is down around 15 F as I ride to work, I enjoy riding. I don't know why, but there's something about it that makes me happy when I ride. Conversely, I start getting really antsy when I have to go several days without riding.