Ok, I am 29 this month. The oldest person I have been with is now 50 (was with this person a long time ago not gonna say wether I was 18 or younger), so thats 21 years older, the last time I was with someone younger, they acted like an idiot, but that was when I was in junior high, like 15 years ago.
I think as of now if I were to find someone younger, it wouldn't be too bad. I would maybe go back as far as 4-5 years. Same as older, just depends. My father was 13 years older than my mom when they got married. When it comes to loving someone, it doesnt matter on age, looks or anything like that. It is all attitude. You love them for them. If you want to find someone younger, then more power to you. Good luck to you