Refers to a woman who is over 15 years old. Describes that ancient women have reached the age of marriage.

The age of hairpin refers to when a woman is fifteen years old. In ancient times, if a woman was betrothed when she was fifteen, she would tie her hair and wear a hairpin that year; if she was not betrothed, she would tie her hair and wear a hairpin when she was twenty. In ancient times, women who turned 15 years old had their hair tied and tied it with hairpins. This is because women who turned 15 years old were called Jiji. This comes from "Book of Rites Nei Principles". The word "笄" in Jiji refers to women's hairpins. Jiji can also be understood. To insert hairpins.

In ancient times, the age of getting hairpins was regarded as a watershed for women to reach adulthood. Women can get married at the age of fifteen, which is called the year of getting hairpins. Men need to wait until they are twenty years old to be considered adults, and men's adulthood is called the age of weakness.