I am 39 but won't touch a guy under 18. I think 16 is legal in my state, but I have no plans on testing the boundary lines. Black and white stripes clash with my eyes LOL.
When I was 19 I fucked several guys in their mid to late 60's and one guy that said he was 73 although he seemed awful spry and horny for a 73 year old. When I was in my early 20's (like 22-26) we had a neighbor for 4 years that was 76 (I guess he was 80 by the time we moved away). He didn't want to fuck me because of loyalty to his wife...but he didn't mind a regular blowjob