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In 1970, boys reached the last Tanner stage, the postpubertal stage, ... the average age for an American girl to get her period was 16 or 17. Today, that number has ...
If your daughter is between the ages of 8 and 12, you've probably talked to her about periods and what to expect when hers arrives. But it's also important for the boys in your home to understand ...
On average, females begin puberty at age 10½ and complete puberty at ages 15-17; males begin at ages 11½-12 and complete puberty at ages 16-17. [1] [2] [3] The major landmark of puberty for females is menarche, the onset of menstruation, which occurs on average around age 12½. [2]
Being prepubescent is not the same thing as being preadolescent. Instead, prepubescent (and sometimes child) is a term for boys and girls who have not developed secondary sex characteristics, [15] while preadolescent is generally defined as those ranging from age 9 to 12 years. [16] Preadolescence may also be defined as the period from 10 to 13 ...
The gross reproduction rate (GRR) is the average number of daughters a woman would have if she survived all of her childbearing years, which is roughly to the age of 45, subject to the age-specific fertility rate and sex ratio at birth throughout that period.
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In the United States, girls are considered to have delayed puberty if they lack breast development by age 13 or have not started menstruating by age 15. [1] [2] Boys are considered to have delayed puberty if they lack enlargement of the testicles by age 14. [2] Delayed puberty affects about 2% of adolescents. [3] [4]