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The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
Menstruation occurs on average once a month from menarche to menopause, which corresponds with a woman's fertile years. The average age of menopause in women is 52 years, and it typically occurs between 45 and 55 years of age. [50] Menopause is preceded by a stage of hormonal changes called perimenopause. [7]
Girls have started getting their first period earlier than in the past, so now it's considered "normal" for girls to get their period between 9 and 14 years old, says Maureen Whelihan, M.D., an ob ...
“Among individuals born between 1950 and 2005, we found that younger generations were starting their first period (menarche) earlier, and the time it took for their periods to become regular ...
The first period, a point in time known as menarche, usually begins between the ages of 11 and 13. [1] Menstruation starting as young as 8 years would still be considered normal. [ 2 ] The average age of the first period is generally later in the developing world , and earlier in the developed world . [ 3 ]
The researchers also found that age at menarche is now more likely to occur before the age of 11 years, which the authors class as “early” — increasing from 8.6% in the 50s and 60s to 15.5% ...
Upon menarche and completion of the ritual, they have become a woman as defined by their culture. For young women in many cultures, the menarches are a marker that signifies a change in status. Post-menarche, the young woman enters a stage called maidenhood, the stage between menarche and marriage. [ 41 ]
According to a new study published in JAMA, menarche — the first period — has occurred steadily earlier and earlier for generations since the 1950s. Researchers examined data collected from ...