The old man said he wouldn't go out at seventeen and wouldn't go home at eighteen, right?

What the old man said is' seven days without going out and eight days without going home', which is generally interpreted as: seven days without going out and eight days without going home, which is wrong.

Seven don't go out, eight don't go home' is really the education left by our ancestors. The correct explanation is: seven don't go out, which means pointing out seven things in front of the door. If you don't do well, you can't go out. These seven things are' firewood, rice, oil, salt, sauce, vinegar and tea', because women were not allowed to go out or rarely went out before. A man is the head of the family. If you want to go out, you must first arrange the basic life at home and solve the problem of feeding your wife and children, so that you can go out at ease. Eight don't go home, that is, there are eight things that must be done well when you are away from home. You can't go home without doing well. These eight things are filial piety, kindness, faithfulness, courtesy, righteousness, honesty and shame. These eight things are the basic moral principles of life in ancient times. Violating any of them is a disgrace to our ancestors and to our family.