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But girls mature physically before boys, generally, and look like they have matured some. The average age of menarche in the US is 12. Once that's happening, a girl can obviously get pregnant. My son is 12 and most of his friends are just now starting to grow underarm hair, have some voice changes, etc. Some of them look much older than this kid does, some of them look like that kid. The ones who look older (starting to get the peach fuzz moustache, etc), I would expect them to be fertile. I wouldn't necessarily expect the younger looking ones to be fertile yet.
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