Menstruation Coming Faster

Do you remember at what age when you first get menstruation? If you get the first menstrual period at age 14 years, why do girls go through that at the age of 9 years?
The age when a girl when you first get menstruation varies greatly. However, over lifestyle changes, the current trend of girls getting the first menstrual period at a younger age. Some even in the age of 7 years already menstruating. Why? And what causes it?
There are two factors that cause menstruation came earlier, namely internal factor and external factor. Internal factors that occur because of hormonal imbalances from birth. This condition was later driven also by external factors, such as food (especially junk food), the modern environment and the level of prosperity of the community in an area. You need not worry, the important is menstruation come regularly every month and do not feel the symptoms PMS are excessive, so come early menstruation is not a condition to worry.