I have person who works for us - plays sports (soccor) and is about 30, in pretty good shape too. Has been working for the last 2 months to get in condition to go riding with me. You see, he sees me come into the office everyday - and I have passed him on the road before, he was in a car, I was on a bike...
I told him I would be nice on the ride if he wanted, but he still is working at it. I think it is demoralizing when you are 30 and a guy with white hair and nearly fifty is destroying you.
Nothing like riding everyday to make you insanely fit.