At what point do you think a man should hang it up, I mean stop cruising, accept that those days are behind him? Is there any specific age, I wonder? Anon.
Given how people live longer today and the "senior" crowd -- gay and straight -- is still sexually active, I don't know if anyone should ever "give it up." It really depends on a lot of factors.
As long as a man is attracting other men to him -- and I don't mean that every head turns when he walks in the door, but that guys do at least on occasion let him know that they're interested -- I see no reason why he should stop cruising, or at least think of himself as "past it." I mean, a man can go to a bar one night and feel invisible, with no one hitting on him, or striking out as he makes passes, but then a week later there are more guys in the bar (or a different bar) who like his specific type, and he finds himself in the position of (nicely) rejecting people. You never know how it's gonna go. Guys, especially as we age, can be very sensitive to this, and one has to remember that even younger, "hotter" guys can have a bad night or a string of them. It's important not to despair.
Some guys of a certain age don't actively cruise. They wait for people to express an interest and now and then may get lucky. Other guys are more aggressive and may or may not be more successful. Some guys just tell themselves that they're over-the-hill and jerk off, or become more or less asexual.
Then there are guys are who really lousy at cruising in bars and do much better on-line. I'd suggest before giving up on cruising/dating/sexual activity entirely, a man should try the on-line dating/sex sites that cater to older men and their admirers, such as silver daddies.
Older men -- especially those who are predominantly attracted to younger guys -- should avoid the pitfalls of cruising in a bar that caters mostly to, say, twenty-somethings. There are young men who like older men (for various reasons) but they tend to go to bars that cater to the middle-aged [and older] crowd. If you do go to a bar full of twenty-somethings, at least go late when they're more likely to be a little snookered and approachable. You may not get laid but at least they'll talk to you!
I have encountered middle-aged men who are fresh out of a twenty-something bar down the block and are miserable as hell, feeling old, rejected and desperate, when the truth is that there are many men their own age who would find them perfectly sexy. Unless a guy is extremely handsome, hot or rich, it's difficult to be in middle age (or older) and be exclusively attracted to much younger men.
There are still a lot of attractive (whatever your taste) older guys out there, and all of us "of a certain age" -- and we are legion -- should take advantage of that fact.
If a man really feels that he is just too old to attract sex partners, he can still enjoy the joys of masturbation, his friends, other activities that add joy to his life.
But remember that I've known guys as old as their seventies who cruise -- in bars -- and are successful at it more often than not.
You just never know.