I'm 64, and it's not so much that it drops, but I sure as hell can't seem to go any faster these days.If you are over 60 and cycling for pleasure only, do you find that your average speed drops the older you get?
On a very hilly 60k loop that I like doing, I just cannot average much more than 24kph. I don't worry about it though. I just love being out on the bike as often as I can. What I have noticed with age though, is that if I have a layoff for some reason or other - a lot of work, bad weather, whatever - it gets harder and harder to get back into the rhythm of my normal rides.
Plenty of oldies riding round where I live. Sometimes I pass them, sometimes I get passed, but there's one well known old guy in his seventies who rode pro when he was young, who can blow some of the youngsters away. Got to admire blokes like that!