养老金: pension funds
社保基金: social security funds
基本养老保险: basic endowment insurance
基本医疗保险: basic medical insurance
工伤保险: employment injury insurance
失业保险: unemployment insurance
生育保险: maternity insurance
住房公积金: public housing fund, housing accumulation fund
弹性退休金制度: flexible pension system
延迟退休: delay retirement
提前退休: early retirement
老龄化: population aging