The meaning of no stay at your house when you are seventy, no food when you are eighty, and no sitting when you are ninety is as follows:

If an elderly person comes to your home for a meal after the age of 70, do not force him to stay overnight; Elderly people over 80 years old should not be forced to eat; elderly people over 90 years old should not even sit down, because the elderly are old and in poor health. Accidents are most likely to occur in the middle of the night and in the morning. Something will cause great difficulties.

The two most dangerous "death triads" for the elderly are "winter, early morning, and snow clearing" when the sun rises in the east. Moreover, during these three time periods, the elderly's hearing and vision have declined. When staying overnight in a strange place, elderly people who are not familiar with the environment can easily trip over obstacles and cause accidental injuries when they get up at night. Therefore, try to avoid letting the elderly stay outside overnight.

When you are seventy, you will not stay overnight, when you are eighty, you will not stay for food, and when you are ninety, you will not stay for a seat. This is a common saying with no origin. Related proverbs include: If you are very clever, use seven points and leave three points to pass on to your descendants. There is no dutiful son at the bedside of a long-term illness, and there is no virtuous wife in a house that has been poor for a long time.

Knowledge expansion:

Slang is one of the idioms, which refers to sentences that are conventional, widely popular, and have concise images. From a broad perspective, colloquialisms include proverbs, idioms (quotations), idiomatic expressions and commonly used spoken idioms, but do not include dialect words, colloquial words, idioms in written language, or famous aphorisms in famous books.

In a narrow sense, colloquialism is one of the genres with its own characteristics, which is different from proverbs and idioms, but some colloquialisms are somewhere in between. Common sayings come from a wide range of sources, not only from the oral creations of the people, but also related to famous poems, aphorisms, historical allusions, etc.