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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]
The worldwide average age of menarche is very difficult to estimate accurately, and it varies significantly by geographical region, race, ethnicity and other characteristics, and occurs mostly during a span of ages from 8 to 16, with a small percentage of girls having menarche by age 10, and the vast majority having it by the time they were 14. [3]
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 ]
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 ...
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]
After ‘years of forced silence,’ Spanish women’s soccer players speak openly about Luis Rubiales’ kiss in new documentary George Ramsay, CNN November 26, 2024 at 11:46 AM
Ages of initiation school attendance range from 12 to 20 years old however the generally accepted age for girls is between 15 and 18. The incidence of a girl's first menses, ‘menarche’, is regarded as a positive indication for physical and spiritual readiness for initiation school attendance. While having reached puberty is a good indicator ...