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The average age of American women having their first child reached a record high of 26 years old in 2013, according to the Centers for Disease Control and Prevention's National Vital Statistics Report.
Next comes the pubertal growth spurt. Lastly, menstruation begins (called menarche), on average, 2-2.5 years after the onset of puberty. The mean age for a girlâs first period is 12.75 years.Wide variations are seen in the sequence and timing of these events, but peak growth velocity (fastest growth rate) always precedes menarche.ow for the crucial information: The earlier before age 12 a girl starts her period, the higher her lifetime risk for breast cancer (probably from the prolonged estrogen exposure). The highest average risk for breast cancer is in non-Hispanic white women, where it is 1 in 8, or 12.5%.