Men can have children even in their 80s, rich people do it all the time.
> Instead, he said: “There’s this mistaken belief that men are fertile across their lifespan, so there’s no imperative to get on with it.”
As they get older, the chance of random infertility increases but this is something that's present at any age.
The bigger impediment would be age difference though. I wouldn't want to have a child in my 50s as I'd be so out of sync with their life.
I'd wager most of these men who are sad they missed out would rather have a child at 50 than never at all.