Meaning of generations in this context

Hi~ what do you think the meaning of "generations" in red is in this context?

All the people living at the same time or of approximately the same age ?

OR emergence of women? I'm wondering which one is correct or better...

Thanks for sharing your idea~

The increase in physical acts of bullying by girls can be partially attributed
to increased levels of testosterone. Congenital Adrenal Hyperplasia
(CAH) causes female fetuses to produce larger amounts of testosterone.
Girls who produce higher levels of testosterone
are often the tomboys who usually grow out of more masculine
behaviors after puberty. However, many researchers think that CAH in
conjunction with increased levels of testosterone in food, generations of
women in the workforce competing with males, and access to more
physical sports have all attributed to a small portion of girls having high
enough testosterone levels to behave like frogs, snails, and puppy-dog tails.