Is it cost-effective to buy social security by yourself at the age of 28?

Of course, you can buy social security from the age of 28 to 40, but 15 hasn't bought it yet, and it will take two years to retire at the retirement age.

However, if you stop paying medical insurance, as long as you stop paying for more than 180 days, you can't renew your medical insurance. If you want to pay from scratch, you have paid medical insurance for more than ten years, which is not cost-effective.

If there is a company to help you pay, you'd better pay. Anyway, the company pays 2/3, and you pay 1/3. What is not worth it?

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