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Girls experience menarche at different ages, but the most common age is 12. [1] [2] Having menarche occur between the ages of 9–14 in the West is considered normal. [3] The timing of menarche is influenced by female biology, as well as genetic, environmental factors, and nutritional factors. [4]
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]
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] In precocious puberty, it can occur as early as age eight years, [43] and this can still be normal. [44] [45]
Having the right amount of body fat is critical to producing the hormones that lead to your first cycle, which is why girls tend to put on a little weight before they have their menarche, she says.
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] The time between menstrual periods (menses) is not always regular in the first two years after menarche. [61] Ovulation is necessary for fertility, but may or may not accompany the earliest menses. [62]
“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 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]
Primary amenorrhea is defined as an absence of secondary sexual characteristics by age 13 with no menarche or normal secondary sexual characteristics but no menarche by 15 years of age. [3] It may be caused by developmental problems, such as the congenital absence of the uterus, failure of the ovary to receive or maintain egg cells , or delay ...