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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 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]
Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
In the Philippines, a popular coming of age celebration for 18-year-old women is the debut. It is normally a formal affair, with a strict dress code such as a coat and tie for the upper-middle and upper classes, and usually has a theme or color scheme that is related to the dress code.
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]
Menopause is the opposite of menarche, the time when periods start. [12] In the years before menopause, a woman's periods typically become irregular, [13] [14] which means that periods may be longer or shorter in duration, or be lighter or heavier in the amount of flow. [13]
Primary amenorrhoea is the absence of menstruation in a woman by the age of 16. [11] Females who have not reached menarche at 14 and who have no signs of secondary sexual characteristics (thelarche or pubarche) are also considered to have primary amenorrhea. [12]