Well I am 39, never was super fast even in top condition. I can hold my own with the average roadie though. There is a little old dude that I've seen for a few years that always rides the local tours, and I always look for him when I go. His cadence matches mine perfectly so I usually try to find him in the pack and we ride and visit together, occasionally forming a pace line with whoever happens to join in. I knew he was alot older than me, but last spring I finally asked him old he was, he said 68. I couldn't believe it, he's fast even for a much younger rider. So I guess it really doesn't matter how old you are in years...