How many years of social security should I buy after 80?

Social security consists of several major items. Let's talk about medical care and old-age care. The minimum payment period of this part of the pension is 15, and the medical regulations are that girls can enjoy lifelong medical insurance only if they pay at least 25 years and men pay at least 30 years. But now medical insurance and endowment insurance can't be bought separately. The state also stipulates that as long as they work normally, they must pay social security according to law. So, they have to pay at least 25 years.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.