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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]
[3] [9] The average age of menarche has changed little in the United States since the 1950s. [3] Menstruation is the most visible phase of the menstrual cycle and its beginning is used as the marker between cycles. The first day of menstrual bleeding is the date used for the last menstrual period (LMP).
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]
Intimacy is a normal biological activity that healthy individuals can engage in frequently. Regular or daily intimacy may actually provide real benefits to your physical and mental health.