Now girls menstruate, the age at which girls menstruate

In 1978-1980, the relevant units conducted a survey on the menstruation of 130,000 women in 29 provinces, municipalities and autonomous regions across the country, and found that the youngest was 9 years old, the oldest was 21 years old, and the vast majority were 12-19 years old, with an average age of 15. The age of menarche is the highest in urban women at 15 years and 16 years in rural women. Another survey from 1978 to 1979 showed that the average age of menarche was the earliest in Guangzhou and Beijing, respectively. The latest is Shandong, with an average of years.

Menarche has early and late periods, and it is generally believed that it has a lot to do with heredity. If the mother has an early menarche, the daughter will also have an early period; Mother's menarche is late, and daughters may also be late. But this is not absolute, it can be affected by other factors.

There is also a view that, due to the increased contact between the sexes due to the urban lifestyle, some have more opportunities for sexual knowledge, and the regulation of the endocrine glands by the nervous system causes the sex-related endocrine system to be activated prematurely, thus leading to the early initiation of menarche.

In addition, the morning and evening of menarche are also related to physical health, mood, nutrition, etc. Living conditions are now better than before, so the time of girls' first menstrual period is also earlier In short, the early and late onset of menarche is affected by many factors, so individual differences can be great. Menstruation from as early as 9 years of age to 18-19 years of age and as late as 18-19 years of age is considered a normal range if there are no other abnormalities.

If you have menstruation at the age of seven or eight, or if you have not menstruated at the age of 22 and have other symptoms, you should go to the hospital to find out the cause and get it as soon as possible.

12 years old is just right, it's normal for girls to start developing at the age of 12.

It's normal for you now, your mother, it's late, but that doesn't mean it's late ripening, it's a natural phenomenon to come late, and it's not a big deal.

Today's girls are developing earlier than before, because living conditions are better now.

The physiological process of girls, from early childhood, childhood to puberty, is a gradual and cumulative process. The average menstrual cycle of Chinese women is basically 12-13 years old, if you do not have menstruation at the age of 12-13, or even at the age of 18, it may be abnormal menstruation.

Not necessarily, this varies from person to person, the length of the menstrual cycle, depending on the length of the ovarian cycle, is generally 28 to 30 days, but it varies from person to person, there are also 23 to 45 days, or even 3 months or half a year for 1 cycle. As long as it is regular, it is generally considered a normal period. The duration of bleeding is generally 2-7 days, and the total amount of bleeding per menstrual period does not exceed 100 ml.

This is different for everyone.

Everyone's time is different.

Perhaps, it's not like paying a salary.

Not necessarily, everyone's cycle is different.