What was the hairstyle of ancient women before they reached maturity?

Ancient hair buns have obvious age and identity characteristics, juvenile children are hair down, called "tufts of hair", while the girl to the age of fifteen, the hair coiled up, with a "maturity" hairpin good, so-called "years of maturity", the woman and maturity is combed up left and right symmetrical similar to the tree branch fork of the bun, called "bun yat," at the same time, the maidservant also comb such hair, so it is known as the "maid" (also known as "maid"), the hair of a girl with no maturity. "

The specifics of the hair style are as follows.

Specifically look at the picture ↓