I use to be bi and sucked my first cock when I was 12, Well over the years when I was in between girlfriends I would get the urge to suck cock and in my early 30's (before aids) I would go to the adult book stores and sit in a booth and watch gay porn and guys would come to the doorway with their cocks out and wait to be asked to come in. The book store I went to did not have any glory holes. Sometimes I would suck them right there and other times I asked if they had a place to go.
There seemed to always be some older guys in their 50's or older (or at least looked older) sometimes I would suck them and other times I would tell them I wasn't interested. Guys in their 20's and 30's even 40's would complain because these older guys wouldn't leave them alone. Now I am one of those older men at 54 and very seldom I will go to the book store which now has a glory hole.
I will go in and cruise around and the booths do not have doors on them so it's not hard to see who is in a booth. There are some younger guys there but mainly older men. When I am cruising the booths and see a guy jerking to gay porn and doesn't look to bad and looks clean (not like he hasn't showered in a week) I will stand there a minute and might ask if he needs a mouth or ask if he would like help with that. If he says no to either I cruise on by and do not bother him again.
A little advise for older men (any man for that matter) if you see someone you want to suck off or more and the person tells you he is not interested or shows no interest LEAVE him alone, He might just be there to bust a nut and go or he may not be looking for older men and by going back to his booth numerous times it only ruins he's night because someone (mostly older ) keeps bugging him. If he is not interested just leave him alone period. if by the end of the night if he doesn't find what he was looking for he might just come to you. So for older men that bug guys quit being trolls as they call it and let it go.