Flower armor means 60 years old. The word "Hua Jia" comes from the ancient calendar of China, which takes 60 years as a cycle, and each cycle is called "Jia Zi", which is also called "Hua Jia" because of the various names of branches and branches.

Another way of saying this is that there is a white mark at the root of a person's nail. By the age of 60, with the aging of the body, this white mark will disappear, so it is called "flower nail". Of course, there are exceptions, for example, people who are in good health are over 60 years old and still have white marks, while some people are weak and may not have white marks before they are 60 years old.

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People are used to calling people over 60 "sixty-year-olds" and "sixty-year-olds". "Huajia" is the abbreviation of "Huajiazi", and the origin of this name is closely related to the chronology of branches in ancient China.

Dry branches, that is, heavenly stems and earthly branches. Heavenly stem is called "stem" and earthly branch is called "branch", which is a symbol of counting and timing that has appeared in ancient times. There are ten heavenly stems, namely, A, B, C, D, E, G, G, Xin, N and G.

Named after heavenly stems and earthly branches's intricate name. Ji Gongyou's Chronicle of Tang Poetry (Volume 66): "Li Changji, a middle school student in Xian Tong, Dazhong, is a short song. He said to the wine,' Move sixty flowers with your hand, and the cycle falls like a pearl.'" (Zhao Mu)