in the gay community it's not actually all that uncommon for older men to be interested in younger ones.

My stepsister's ex husband is involved with a guy barely older than his own (adopted) son, which is a little creepy. It the straight community it's not all that unusual for older guys to be interested in younger women. I'm not saying it's always bad, but... well. 10 years, though, is not all that bad. As I was assured by a guy 10 years younger than me who was at least sort of hitting on me at the time, and who is now, to the best of my knowledge, involved with a woman almost exactly my age.