Something you need to keep in mind when it comes to historical medical surveys is that we screen people far more routinely than we once did for a wide variety of medical reasons. Not only that, but a lot of medical conditions/phenomena are not nearly as socially stigmatized as they once were. Thus, we’re much better at finding these phenomena in people. It’s possible that people were always beginning puberty at around 10-12, it’s just that we’re better at noticing it nowadays due to more routine medical screenings.
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