Girls, What age do most women start wanting to have children?

I know some girls don't want children, but others have said they impulse to have children becomes stronger as they reach their late 20's.

Just curious if there was a particular age when girls started wanting babies?
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I asked this question after a conversation with two female colleagues recently, one said she had no desire for children until she was 27 or 28, and "boom', she felt a real urge at that point. The other woman said she always intended to have children, but she too found in her late 20's it dominated her mind more. It just made me curious if all girls are similar, although I do see some differ on the specific age. Men are definitely different in this regard
Girls, What age do most women start wanting to have children?
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