Why is it guys have such issues with a beautiful girls/women in general dating the party guy, jock, alpha male, or the handsome/popular guy in their teens/20's

But as they mature into their 30's decide to go for something different, or someone they would not have considered dating/sleeping in their 20's, teens?

Many guys seemt to have issues with that and basically champion to other males that they shouldn't go along/date/marry women who now show interest in them in their 30's. Is the male ego so shallow/brittle that they can't see that women in question matured, became less shallow, learned from her past mistakes, and now prioritize traits that these guys posses that she didn't consider important in her youth?
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