48 years old, didn't buy social security. What insurance is better to buy now?

I didn't buy social security at the age of 48, so I might as well buy resident pension insurance now. If you don't buy social security at the age of 48, there is no security after retirement. Ordinary insurance is accident insurance, so you can only buy old-age insurance for residents to ensure your income in your later years. So I didn't buy social security at the age of 48, so I might as well buy resident pension insurance now.