Exposure to xenoestrogens, processed food, plastics, and phthalates may contribute to early puberty in females and delayed puberty in males.

“this this hypothesis which i think is fairly compelling that the girls had puberty earlier and earlier because all the xenoestrogens and maybe i was exposed to xenoestrogens and that was causing me to be delayed in puberty as a man or who knows i don't know why i was delayed but i was certainly within tribes like the hadza the women hit puberty later than they do in the u.s so they have fewer reproductive years when they're not exposed to processed food and plastics and phthalates and xenoestrogens”