I looked up stats on what age men are marrying. It is later than it used to be, but not true that most men marry after age 30. Slightly less than half of men wait that long. This Map Shows The Average Marrying Age Around The World | The Huffington Post

I suppose I have to be a bit blunt. Men who've stayed single past the age of 30 have gotten in the habit of getting their sexual appetite satisfied in the context of casual relationships, one night stands, and often with women who are quite loose. Ten years, or so, of doing that can be a hard habit to break. Fidelity may be a bigger struggle for these men. They've grown accustomed to thinking of sex as a physical function, rather than as an expression of deep feeling. I don't say this is all men. But I would apply it to men who are attractive and socially confident. Such men have gotten used to getting a roll in the hay in exchange for dinner and a few drinks. A decade of doing that, I believe, has a corrupting effect on a man's attitude toward women. It also allows a man to stay at a lower level of emotional maturity than would be possible were the man meeting the demands of a commited relationship. We live in an age where casual sex is available readily. I'm no prude and never lived like a nun, myself, but I think too many years of casual sex desensitizes a person, especially a man. The man gets used to remaining emotionally at a distance from the women he goes to bed with. I think that coarsens a man's nature. Or the man spends too much time looking at men's magazines and pornographic videos, and that becomes a habit that's hard to break.