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Some estimates suggest that the median age of menarche worldwide is 14, and that there is a later age of onset in Asian populations compared to the West. The average age of menarche is about 12.5 years in the United States, 12.72 in Canada, 12.9 in the UK and 13.06 Â± 0.10 years in Iceland.A study on girls in Istanbul, Turkey found the median age at menarche to be 12.74 years.ost sources agree that the average age of menarche in girls in modern societies has declined, though the reasons and the degree remain subjects of controversy. From the sixth to the fifteenth centuries in Europe, most women reached menarche on average at about 14, between the ages of 12 and 15.
Womens Health Â» M Â» Menarche. The average age of menarche, or first menstruation, in the United States is 12.88 years for Caucasian girls and 12.16 years for African American girls. A popular misconception is that menarche marks the beginning of puberty; in reality, menarche occurs later in puberty. According to the widely used âfive Tanner stagesâ of pubertal development, the onset of puberty is identified as Stage 2 at the first signs of pubic hair and breast bud development.