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In very rare instances, menarche may occur at an unusually early age, preceding thelarche and other signs of puberty. This is termed isolated premature menarche, but other causes of vaginal bleeding must be investigated and excluded. [16] Isolated premature menarche is rarely the first manifestation of precocious puberty. [citation needed]
The first menstrual bleeding is referred to as menarche, and typically occurs about two years after thelarche. [53] The average age of menarche is 12½ in the United States. [58] 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.
The average age of menarche is 12 to 15 years. [1] [8] However, it may occur as early as eight. [2] The average age of the first period is generally later in the developing world, and earlier in the developed world. [3] [9] The average age of menarche has changed little in the United States since the 1950s. [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]
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]
For females, it is menarche, the onset of menstruation, which occurs, on average, between ages 12 and 13. [12] [23] [24] [25] The age of menarche is influenced by heredity, but a girl's diet and lifestyle contribute as well. [12] Regardless of genes, a girl must have a certain proportion of body fat to attain menarche. [12]
Menarche, the onset of menstruation, occurs on average at age 12–13. Many cultures have rites of passage to symbolize a girl's coming of age , such as confirmation in some branches of Christianity , [ 24 ] bat mitzvah in Judaism , or a custom of a special celebration for a certain birthday (generally between 12 and 21), like the quinceañera ...
Spermarche, also known as semenarche, is the time at which a male experiences his first ejaculation. [1] It is considered to be the counterpart of menarche in females. [2] [3] Depending on upbringing, cultural differences, and prior sexual knowledge, males may have different reactions to spermarche, ranging from fear to excitement. [4]