When did puberty start in girls in the 1960s?

In the 1960s, the average onset of puberty in girls typically began between the ages of 11 and 12, though variations existed. Factors such as genetics, nutrition, and overall health influenced the timing. The trend has shown a gradual decrease in the age of onset over the decades, with some girls starting as early as 8 or 9 in recent times. Overall, societal and environmental changes have played a role in this shift.