I'm 60, and within the set of 60 year old guys I'm probably in the top 10% in terms of fitness. However, within the subset of 60 year old male cyclists, since I've gotten a lot stronger and also more comfortable with long miles...I'm probably approaching the median. Getting passed going uphill by some youngster doesn't bother me. Getting passed going uphill by some guy a decade my elder - and him not breathing hard - shows me how much farther I have to go.