Maybe the thread weddings will be like buses, @StealthNinjaMum. 😂
I think younger (millennial) men often have learned to present themselves if more woman-friendly ways. They'll say the right things. But I'm not sure the underlying thoughts, feelings and motivations are all that different. They just sound more plausible. (This is based on my observations of and conversations with many years of undergraduates). And the research does clearly tell us that, as a generation, their attitudes to and expectations of sex are very different to back when I was young. That's not so much an issue if you're a 40 year old woman who is up for anything, but it's something that does really affect young women starting out their sex lives.
There is also probably something in the fact that in your early 20s it's pretty standard to jus be single. So you're getting the ones pre big relationships. Often the older ones are single after the failure of a marriage (or marriage like relationship). So there's just more baggage. And, yes, some of them are single for a reason.
I think the arseholes just seem more inclined to message quickly (and indeterminately) on OLD or are more memorable in their crap interaction style. There will also be a higher proportion of cheating arseholes in the older groups because fewer of the younger men have married yet. And the weird ones with no social skills who seem to be looking for a pen pal (because they never go out and stay in playing video games and stroking their... cats - and probably other things) definitely stand out as a higher proportion of the older men you interact with too. They are there in every group but their relative proportion probably increases as their peers (who they only interact with through gaming headsets) pair off and have proper relationships (while they just get weirder).
Of course, there are lovely ones out there (MrSG is 40). As we on this thread all know, there are all sorts of reasons why anyone might end up single at any age.
(I may be drawing upon personal experience about the weirdo pen pals there 😂)