Cardamom is thirteen or fourteen years old to fifteen or sixteen years old (Cardamom is a plant that blooms in early summer, but not yet in midsummer, which means that people are still underage, so it is called "cardamom youth"). In Du Fu's "Farewell" poem, "Flowers are more than thirteen, and cardamom is in early February".

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Hair was tied when a man was fifteen (when he was fifteen, a man would dissolve the original corner and tie it into a bundle). There is a saying in "Wearing Li Ji" that "I want to go to college with my hair tied".

When a woman was fifteen years old, when she reached the age of fifteen in ancient times, she put her hair up and clamped it with a hairpin, indicating that she had reached adulthood. There is a saying in the Book of Rites that "(a woman) died for five years in ten years".