I am definitely in the 'older man' category now - downright ancient in gay terms, as I hit 65 at the end of June.
I'm lucky, I guess, that folk don't believe that - even when unclothed in a sauna.
I have a younger way of looking at Life, and have a can do attitude - glass half full, rather than half empty.
I have met geriatric 20/30year olds, and also life enhancing older men. Age itself is what you make of it. Sexually I like a bit of meat and heft, so mostly not likely to go for men under 30 - but an enthusiastic proficient younger happy fucker is always welcome!!