I'm 47 and ride like a bat out of hell, and a rider in my group (Tom) is 72 and he's always the first one to the top of the hills. When he passes me (and the other 30 yr olds in the group) going up these hills (I'm doing maybe 250-300 watts), I'll often look over at him as he passes, and see that he's barely breathing. Tom's a true inspiration of mine, and he makes me look forward to getting old and being able to ride like a bat out of hell until my final days.