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Those numbers aren't constant or the same for every group of people. There are genetic pools where girls reach puberty earlier than that.

Ex: https://www.nature.com/articles/ncomms8672



The linked paper doesn't obviously support the claim you're making here. Maybe I've missed something?

"The median age at menarche was 14.5 years (95% CI=14–15; Nindividuals=128; Nobservations=199), which is within the range of variation of modern populations."




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