The term “great aunt” is generally used clinically to refer to menstruation, which most often begins between the ages of 13 and 14, but may occur as early as 11 or as late as 16. The age of first menstruation is usually between 13 and 14 years old, but may be as early as 11 years old or as late as 16 years old. The early or late onset of menstruation is mainly controlled by genetic factors. In addition, over-nutrition tends to lead to earlier first menstruation, and if you are overweight or malnourished, it may lead to a delayed first menstruation, which usually occurs between the ages of 13 and 14. Generally in the first two years of menstruation, irregular menstruation occurs, this is a normal phenomenon. Girls who are having their first period should not exercise strenuously to avoid excessive menstrual bleeding and prolonged periods. It is recommended that patients who have their first period too early or too late should go to the hospital in time to avoid delaying their condition.