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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]
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 ...
The average age of the first period is generally later in the developing world, and earlier in the developed world. [3] The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women. In adults, the range is between 21 and 35 days with the average being 28 days.
Menstruation (also called menstrual bleeding, menses or a period) is the first and most evident phase of the uterine cycle and first occurs at puberty. Called menarche, the first period occurs at the age of around twelve or thirteen years. [8] The average age is generally later in the developing world and earlier in the developed world. [42]
The findings, published May 29 in JAMA Network Open, indicate the average age at menarche — an individual’s first period — decreased from 12.5 years for those born 1950–1969 to 11.9 years ...
Girls are getting their periods earlier than ever. Here’s how menstrual education needs to change. ... The average age of a girl’s first period has dropped to just under 12 years old ...
Most American females experience their first period at 11, 12 or 13, but some experience it earlier than their 11th birthday and others after their 14th birthday. In fact, anytime between 8 and 16 is normal. In Canada, the average age of menarche is 12.72, [59] and in the United Kingdom it is 12.9. [60]
In girls, puberty and periods normally start between the ages of 10 to 15, but experts say this has been getting earlier in recent decades. In girls, puberty and periods normally start between the ...