Most girls will grow armpit hair around the age of 11~13, some may grow it slightly earlier and some may grow it slightly later.
Armpit hair is a secondary sexual characteristic of women, and estrogen levels have a certain relationship, most girls will enter puberty around 11~13 years old, when the function of the ovaries began to develop and secrete estrogen, estrogen levels rise will prompt the development of secondary sexual characteristics, and at this time will begin to grow armpit hair.
However, everyone’s situation is different, some girls may develop a little earlier, and some girls may develop a little later, which is considered normal.
It should be noted that even though some girls may develop a little earlier, the earliest age should not be earlier than 8 years old. If the secondary sexual characteristics such as armpit hair appear at or before the age of 8 years old, it is necessary to pay attention to it and go to the hospital to rule out precocious puberty.