The year when the ancients wore their hair was 15 years old. Before the Qing Dynasty, Han boys 15 years old had their hair in a bun. In ancient times, boys could go to college when they were old enough to tie their hair. As the Book of Gifts and Fu Bao says, "When you tie your hair, you can go to college, learn great art and complete great festivals." The age of ancient people is sometimes not expressed by numbers, not by telling someone's age or age directly, but by an age-related title instead.

Many ancient age names are related to hair. In addition to sagging, there are total angles, bunches, weak crowns, wrinkles and yellowing.

In ancient times, children parted their hair and tied it in two knots on both sides of their heads. Because it looks like an angle, it is called the total angle, which refers to the age of eight or nine to thirteen or fourteen. Later, people also used "the turn of the total angle" to describe the good friends they made in their early years.

Weak crown refers to the adult ceremony of ancient men at the age of 20 and wearing a crown. So the body is not strong enough, so it is called weak crown.

Standing: refers to 30 years old. The language "The Analects of Confucius is a government" is "standing at thirty". In the future, thirty will be called the year of "standing". Long Qing, a lonely monk from a strange story in a strange studio, said, "When a friend comes to his hometown, he respects him and sees that he is silent and sincere. He is only one year old."