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Precocious puberty on the rise. In the mid-19th century, girls had their first periods — which typically come about two years after they begin to show signs of breasts or pubic hair — at age ...
[18] [35] [36] As a result, "early puberty" in children as young as 8 and 9 is no longer considered abnormal, particularly with girls. Although it is not considered as abnormal, it may be upsetting to parents [ 21 ] [ 37 ] and can be harmful to children who mature physically at a time when they are immature mentally.
Two of the most significant differences between puberty in females and puberty in males are the age at which it begins, and the major sex steroids involved, the androgens and the estrogens. Although there is a wide range of normal ages, females typically begin the process of puberty around age 10½; males at ages 11½—12.
The researchers found that girls diagnosed with precocious puberty were more likely to have higher BMIs, with increased screen time (girls in the study averaged two hours per day on electronic ...
Another study, which was published in 2024, found that the average age that girls had their first periods decreased from 12.5 years old in 1950 to 1969 to 11.9 years old in 2000 to 2005.
The point at which a child becomes an adolescent is defined by the major onset of puberty. [2] [15] However, in some individuals (particularly females), puberty begins in the preadolescence years. [19] [20] Studies indicate that the onset of puberty has been one year earlier with each generation since the 1950s. [21]
Despite their behaviors, 90% of adolescents "agree that most young people have sex before they are really ready." [ 14 ] The average age of first sexual intercourse in the United States is around 16.8 for males and around 17.2 for females, [ 15 ] [ 16 ] and that has been rising in recent years. [ 17 ]
The research looked at more than 71,000 people born between 1950 and 2005 and found that, as time passed, all groups were experiencing their first periods at younger ages.