1, longevity means longevity, which comes from the Book of Rites and describes that a person can live a long and healthy life.

2, period, generally refers to centenarians. Period is expectation, health is support, that is to say, centenarians can't take care of themselves in their daily lives and need to look forward to the support or care of others.

Expand knowledge: the year of the Zhang family: 50; Zhang Xiangnian: 60; Zhang Guo year: seventy; The year of the rod: eighty; Gray: That old man. The old man's hair is gray because it refers to the old man. Yellow hair: refers to the long-lived elderly, refers to the elderly, and the hair of the elderly turns from white to yellow.