Not very old. Make it 5 years both ways. I was involved with an older man, he didn't know my tastes in music (his was a generation older), didn't have much to say to my friends as all my friends were around my age and we hung out a lot together...I wouldn't repeat the experience. Looks-wise he looked very young so physically we appeared to be about the same age. We were miles apart mentally, though.
Yeah, I think 10 years max sounds good...
Ok story to share, might be TMI: A guy I met at a club, only told me his name, and we did some R-rated stuff in the stall... I don't know how old he is, but I think he's in his mid-30's, I'm 20. Is that bad?
IDK, it really depends on the man. I won't cross a man off of my list just because he's x number of years older than me...I'd rather get to know each person individually and make my decision based off of that.