I am 77. There are times in life when I feel "older" but I don't really think of age generally. On the bike I never feel old. I don't climb well and I'm never going to average 20 mph on my particular local route as I did on my 50th birthday. I'd be lucky to do 16 mph. OTOH, I'm also 15 lbs heaver than age 50. When it comes down to it, I don't really care..