What does this bone with three boundaries mean?

Three limits refer to youth, middle age and old age.

There is nothing to worry about in life. Your body and constitution can be full of youth, middle age and old age. 82 people died. Wives and concubines refer to the Japanese branch with eight characters, which are combined with punishment. The so-called mutual punishment is the punishment for children, the punishment in the morning and afternoon, and so on. Wives and concubines are harmless without punishment.