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Menarche (say MEN-ar-kee) is a girl's first menstrual period. A first period usually happens after breasts, pubic hair, and underarm hair have begun to grow. Menarche is a sign of growing up and becoming a woman. It can happen as early as about age 9 or up to age 15. The first few periods are usually light and irregular. About 2 out of 3 girls have a regular pattern of menstrual periods within 2 years of menarche. 1 During the teen years, periods may become longer and heavier. For more information, see Menarche.
Typically, girls start noticing the changes that occur with puberty be â¦ tween the age of 9 and 11. This may occur as early as age 7, however, this differs somewhat with race. The age of menarche (her first period) is about 2 years after the first signs of puberty.ven if your friends have started to mature before you, don't worry; it's totally natural and there is nothing to be concerned about. Although the average age at which boys start puberty is 12 to 13 it can start at anywhere from 9 right up until 16.