What is the difference between social security contribution 15 and 25 years?

Social security payment 15 and 25 years, the pension you get after retirement is different. After 25 years, I got more pension than I paid in 15 years. Secondly, you can only enjoy lifelong medical reimbursement after the pension has been paid for 25 years, but you can't enjoy lifelong medical insurance after the social security has been paid for 15 years.

Legal objectivity:

"Social Insurance Law of People's Republic of China (PRC)" Article 16 Individuals who participate in the basic old-age insurance will receive the basic old-age pension on a monthly basis if they have paid for fifteen years at the statutory retirement age. Individuals who participate in the basic old-age insurance and pay less than fifteen years when they reach the statutory retirement age can pay for fifteen years and receive the basic pension on a monthly basis; Can also be transferred to the new rural social endowment insurance or urban residents' social endowment insurance, enjoy the corresponding pension insurance benefits in accordance with the provisions of the State Council.