How many white beards are there in Feng Shui?

These sayings of the old people mainly come from these words in the Book of Rites: stand at thirty, be puzzled at forty, know your destiny at fifty, live at sixty, be thin at seventy, and be old at eighty. Ancient people generally lived to 80 years old, which is considered a high life. Taking 80 as the boundary, 68 is an old age, so the old man's soil is buried in his neck, which shows that he is too old to live.