Can I buy medical insurance and social security at the age of 25?

This is necessary. Go to the social security bureau to buy endowment insurance and medical insurance for flexible employees (self-employed). If the original company agrees, it can also be purchased as a worker, but there are two problems: 1, which needs to pay the company's share, so the cost is higher; You need to pay the company monthly and keep a good relationship with the relevant personnel of the company. The company's handlers are highly mobile, and it will take you decades to buy them.

You'd better buy it if you can, because the amount of pension after retirement is related to your contribution coefficient and years. You'd better buy medical insurance, or you won't get sick. It's best to buy both.

In addition, if you buy it in the company, you can enjoy maternity insurance.

Social security includes: pension, medical care, large medical care, unemployment, work injury and maternity.

Pension and medical care can participate in flexible employment (self-employed), others can only be bought if they work in the unit.

Work-related injuries need to be recognized by the labor department, which means that the unit must apply to the labor department for work-related injuries recognition, so you need to have a good relationship with the unit.

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