When physical characteristics, such as early onset of menstruation or increased height and weight due to better nutrition, change over the course of several generations, it is called a <u>Menarche</u>.
The menarche, or beginning of menstruation, typically takes place between the ages of 11 and 16 years.
The biology of the female body, as well as genetic, environmental, and particularly nutritional variables, affect the time of menarche.
Over the past century, the average age of menarche has decreased, but the extent of the decrease and the causes are still debatable.
Menarche typically occurs between the ages of 8 and 16, with a small percentage of girls experiencing it by age 10 and the vast majority by the time they were 14.
The average age of menarche worldwide is very difficult to estimate accurately, and it varies significantly by geographic region, race, ethnicity, and other characteristics.
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