Why does a woman being in her thirties and older such a turn off to the world?

So I see men dating young women all the time and those men don't want to settle down to or have kids. So I'm a woman who is 31 and don't want to settle down or have kids at all. So men my age or older wouldn't want to date me cause of my age or something? They would rather go for a girl who is 20?

Why does a woman being in her thirties and older such a turn off to the world?
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