Onset of puberty in girls has fallen by five years since 1920, Children

No one is sure what is causing the change

United States: fertility rate 1800-2020

Best Coming-Of-Age Movies About Growing Up, Adulting

At what age did people start puberty in the Middle Ages? - Quora

Young girls are starting to undergo puberty as young as six years

To treat or not to treat: puberty suppression in childhood-onset

Should we be worried about early puberty?, Health & wellbeing

Puberty for girls - physical and emotional changes

Puberty Starts Earlier Than It Used To. No One Knows Why. - The

Puberty Starts Earlier Than It Used To. No One Knows Why. - The

Age of consent - Wikipedia

Why More Kids Are Starting Puberty Earlier Than Ever Before