The age of menarche and menopause varies from woman to woman and is related to the adequacy of each individual’s innate kidney energy. According to the age of menarche, which is 12-13 years old for most women, and the age of menopause, which is 45-55 years old, menstruation lasts a total of 30-40 years during a woman’s lifetime. If there is premature ovarian failure, the period may be shortened by 10-20 years. The age of menstruation may be further advanced due to external factors such as pelvic surgery or damage to the ovaries. So depending on each individual’s specific situation, the length of time it takes to menstruate can vary considerably. Generally, women with short menstrual cycles are more likely to experience early menopause because every woman is born with a fixed number of eggs, and the shorter the cycle, the more eggs she will ovulate at the same age, and the easier it will be for her to end ovulation and enter menopause. If your menstrual cycle is shorter than 28 days, you should pay attention to it. Although a menstrual cycle of 21 days or less is considered pathological, a shortened cycle that is significantly different from your own menstrual cycle should be noted, and a prolonged shortened period is a sign of premature menopause.