I read that suggestion and just laughed. While it’s true that younger 20-something men and older 30-something women are the two “out” groups, saying they should just hook up completely ignores what men want - hint, it isn’t older women.
When I was 24, I was dating a very attractive 37 year old woman.
Some older women want a guy who will be there when they're in the mood, and won't be upset if she finds someone more "appropriate" later, and she will be understanding if the younger guy finds a younger woman. (And yes I'm currently married to a woman who is slightly younger than me).