The average girl in the United States reaches _________, the time of her first menstrual period, sometime between the ages of 12 and 15.

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Menarche refers to a girl's first menstrual period, which typically occurs between the ages of 12 and 15 in the United States. Spermarche refers to a boy's first ejaculation, which usually occurs a few years later. Puberty refers to the overall period of physical development that leads to sexual maturity, which includes both menarche and spermarche. Adrenarche refers to the maturation of the adrenal glands, which leads to the development of pubic hair and body odor, but does not involve the reproductive organs.

The Average Girl in the United States Reaches _________, the Time