Old people over the age of 55 buy health insurance, and the average insurance company can only guarantee them up to 65 years old. It is still unknown whether they want to pass the medical examination. Medical problems after the age of 65 have to be solved through rural insurance or urban residents' medical insurance. It is suggested to directly consider rural insurance or urban residents' medical insurance.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.