Hair-style rules followed by ancient Chinese

There were some general rules to be followed by ancient Chinese ,thus making it easy to specify people's ages, sexes, marital situations and social positions at first sight.
In general, teenage children would tie their hair up in plaits on the top of their heads, one on each side. After boys reached adulthood, they would comb all their hair into a top-knot (called a Jiefa in ancient Chinese), which they either covered with a square cloth or with a hat. People at Jiefa age are expected to get married and in ancient Chinese Jiefa Fuqi means a wife and husband who married when they were young.
Girls would not be allowed to coil up their hair with hairpins unless they were married, if she did so her husband and parents-in-law would look down upon her because she hadn't followed the rules for women's behavior.
Imperial women always guided hair-style fashion in ancient China and there were many professional hair dressers serving in the palace, creating many different hair styles patterns, using beautiful gold, jade or pearl hairpins.
People valued their hair highly and seldom cut it short unless there was something really important happening.