Some questions about social security?

Paying 15 years of accumulated contributions, which is only a minimum number of years to pay pension insurance, that is to say, any person's insurance must pay enough 15 years. After 15 years of payment, if you reach the legal retirement age, you can enjoy the monthly payment, if you do not reach the retirement age, you have to pay until the retirement age, if you do not have the ability, you can apply for interruption. But the pension insurance must pay enough 15 years.