Puberty
On average, girls begin puberty at ages 10–11; boys it's unclear the average age due to the rise of early puberty (according to the 2012 study found African American boys starting to develop on average at age 9 while White and Hispanic at age 10) The experts who did this 2012 study said puberty starts in boys when Tanner stage 2 pubic hair is seen. Stage 2 pubic hair means a small amount of long downy (soft or fine) hair, with color, which is straight or only slightly curled. The hair is seen chiefly at the base of penis. In the past, it was said that for girls, puberty begins around 10 or 11 years of age and ends around age 16. Boys enter puberty later than girls. In the past, it was said that boys usually start puberty around 12 years of age and it lasts until around age 16 or 17." Girls usually complete puberty by ages 15–17, while boys usually complete puberty by ages 16–17. The major landmark of puberty for females is menarche, the onset of menstruation, which occurs on average between ages 12–13; for males, it is the first ejaculation, which occurs on average at age 13. If puberty starts much later than average, the person is sometimes called a late bloomer.