Seventy don't stay, eighty don't eat, and ninety don't sit. "Seventy leaves no food, eighty leaves no food, and ninety leaves no seat" is a popular folk custom. In many areas, people think that after the age of 70, if the elderly go to relatives or friends' homes, the host family should not force them to stay; After 80, don't force him to eat; After 90, if the old man wants to leave, don't let him sit again. If this common belief is violated, people think that it may bring misfortune and disaster to the elderly and their families. Respecting the elderly and filial piety is the traditional virtue of the Chinese nation. This folk custom seems to be contrary to traditional virtues, but it is also reasonable from the perspective of China's traditional funeral customs and the law of human fertility and aging. China people have a traditional order of support and the custom of dying for their parents and widowed elderly people who have no biological children. Under normal circumstances, parents are supported by their sons. If the son dies before his parents, he will be supported by his grandson. If there is no son but only a daughter, one situation is to give her a adopted son-in-law to come to the door, and the son-in-law and daughter will be supported to death. This is called "recruiting a son-in-law to support the elderly". On the other hand, after a daughter gets married, like an elderly couple without children, someone else's adopted son comes to the door to be an adopted son, inherit property and provide for the elderly. The characteristic of this traditional maintenance order is that the elderly never leave the living environment where they have lived all their lives, and get the double satisfaction of belonging and survival security from the familiar living environment, so as to spend their old age safely. This traditional order of support has caused another psychological phenomenon to the elderly in China, that is, they attach great importance to their final place of death. The goal of a perfect ideal is to die in the first room of your home, that is, to die naturally. In the traditional maintenance order in China, filial piety is the moral standard of children and grandchildren who are supporters. "Filial piety" means supporting parents wholeheartedly; "Shun" means obeying parents' wishes. Parents' wish is death, and children must of course obey the wishes of the elderly. For children and grandchildren, only when the elderly can die as they wish can they be regarded by public opinion as meeting the moral standards of "filial piety". At this point, the wishes of the children and grandchildren as supporters are the same as those of the parents of the dependents. After the age of 70, people may get sick and die at any time in their twilight years. If you go out, die in a foreign country or at the home of relatives and friends, it is against the wishes of the old people. Secondly, children and grandchildren who support the elderly will be condemned by conscience and criticized by public opinion because they are unfilial and let the elderly go out and die in other places. Thirdly, the relatives and friends who receive the elderly will have a lot of embarrassment and trouble because of the unfortunate death of the elderly in their own homes. Obviously, this situation is not what everyone wants to see. Therefore, after the elderly reach the age of 70, their children and grandchildren try their best to discourage them from walking around their relatives and friends' homes. Relatives and friends don't welcome old people to their home. Of course. This does not mean that the relatives of the elderly are not related to the elderly. This kind of affection and emotional communication between the elderly and their relatives follows another order of respecting the elderly among the people, that is, during the Chinese New Year holidays, the younger generation should take the initiative to visit their predecessors, and the younger generation should take the initiative to visit the elderly. Even with such a family and emotional communication mechanism, as children and grandchildren, they don't want the elderly to go out. However, due to special circumstances such as family conflicts, missing relatives and friends, and visiting elders older than themselves on New Year's Day, it is still common for the elderly to go out to visit relatives and friends. In this case, relatives and friends will try to persuade the elderly to go home as soon as possible, or inform their children and grandchildren to pick them up as soon as possible. The creed of "seventy don't stay overnight, eighty don't stay for dinner, and ninety don't sit" means that the older you go out, the greater the possibility of an accident. People say that breaking this creed will bring bad luck and disaster, mainly because if something happens to the elderly, it will bring many unexpected troubles to relatives and friends who receive the elderly.