I was 51 when I started back 4 years ago... Could barely make a 3 mile loop around my neighborhood in my cargo shorts. Now I'm doing 15-25 miles 3 days week after work, 40+ miles on weekends, with a few charity metric centuries thrown in here & there all while wearing Lycra!! I'm still the funny looking old due on a bike, but who cares because I'm having so much fun!!!