There were sixty groups in ancient heavenly stems and earthly branches calendar, which were called "Sixty Jiazi". Sixty years goes round and round, so 60 years old is the year of "flower".
Why is sixty called "flower armor"
People are used to calling people over 60 "people over 60" and "people over 60". "Huajia" is the abbreviation of "Huajiazi", and the origin of this name is closely related to the chronology of branches in ancient China. The main branch is heavenly stems and earthly branches. The heavenly stem is called "stem" and the earthly branch is called "branch", which is a symbol of counting and timing that has appeared in ancient times. Together, ten branches are the main ones, starting with "A" and cooperating with twelve branches in turn. By the tenth branch, all ten branches have been matched, so the first branch is matched with the eleventh branch, and so on, and a total of 60 groups are obtained, which are called "sixty jiazi". Sixty years goes round and round, so 60 years old is the year of "flower". According to textual research, in the Shang Dynasty in BC13rd century, there was a record of the date of official support in China. It is generally believed that the date of official support began in the thirteenth year of Jianwu, Guangwu Emperor of the Eastern Han Dynasty (AD 54). Before that, the main branches were added by later generations. Chronology of trunk and branch began to be used in the Eastern Han Dynasty.
Third, the "flower year" is also called the "ear year"
Another way of saying it is that there is a white mark at the root of a person's nail. At 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 still have white marks in their 60 s, while some people are weak and may not have white marks before they are 60 years old.