For those who say the OP’s point isn’t true, take it from someone who’s dating boys in their early to mid-20s, and has seen all of her friends get married to boys in that age range- it is most certainly true.
Almost all the boys’ hair is starting to thin in front, at the very least. For a while I was kind of bothered by it, but since I realized it is so widespread, I decided that it’s just a fact of life to deal with. It’s out of the boy’s control.