Actually, I did twice my age--54*2=108. I know that when training to do a century, one doesn't necessarily have to do 100 miles prior to the ride, but I wanted to make the milestone and have the experience. Also, I know I completed one so it's a confidence booster as well. Did it in not the greatest time or speed, but I don't think it's bad considering it's my first and I was also fighting some wind to boot. 108 miles in 6hrs, 52½ min travel time and with stops, bathroom, eating, 7 hrs, 45 min(got caught in a conversation at the LBS--a bathroom and water stop at the 100 mile mark). If I hadn't gotten caught in a conversation or wasted time looking for a different set of gloves, the time would've been closer to 7½ hours.