For what it’s worth as a DNA scientist I speculate a lot of it has to do with women having children later in life. All cells in our bodies accumulate damage as we age. Cancers are just specific combinations of damage (mutations) that disrupt the cell cycle, and the result is uncontrolled growth AKA cancer. Purely biologically speaking the best time for most women to give birth to the healthiest baby is shortly after puberty.
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