privacy_bodger
[1] puts it at 1.2%, which would be about two million American men.
[1] https://www.washingtontimes.com/news/2011/mar/3/government-s...
Edit: Arguably fairer to just divide by the number of over-40s in America, which would make it only about half a million.
I mean, they could maybe hit the gym, or get rich, or read The Game, or become ardent feminists, or buy Thai brides online (after getting rich). I'm sure the options have not been exhausted. But I think at some point you have to admit that these people were just dealt a shit hand and there's probably not much they can do about it.
Or, if you think they should just work to fix the problem, you have to understand that it's not at all obvious how to do that. I mean honestly, I don't understand why serial killers can find partners and the people I'm thinking about can't. I've no idea what they ought to do about it.
Basically, I think people should try to have some empathy for people who are having a bad time. I don't really get why so many people are so adamant that that should not happen. But I get that I'm not likely to change your mind about anything at this point.
I suspect if somebody is hideously deformed and does not have a working penis, they're going to have a lot of difficulty finding a romantic partner. Presumably there are large numbers of people who have those and similar issues. I think they should be allowed to talk about that, and not have people respond by comparing them to Elliot Rodger.
That these things didn't (Ok I don't know about the penis thing) apply to Elliot Rodger doesn't mean they don't apply to anybody.
Anecdotally, as a virginal twentysomething, long before incels were a thing, I had the idea that I might be better off targeting the lower end of the beauty spectrum. I don't think it makes much difference to your chances of success. Women don't generally think "well seeing as I'm physically hideous, I'd better accept this unappealing romantic offer". I eventually ended up having some totally hot partners, as well as rejections from less conventionally beautiful people.
There's also the issue that you probably wouldn't have a very active or joyous sex life, which your partner will probably have a problem with even if you don't.