Part XXV Retirement for State Employees and Officers. Members who work full -time must contribute a percentage of their salary toward a retirement benefit from the first day of employment.Part-Time Employees. Special valuation rules. Retirement Plan Contributions. The Social Security number (SSN) was created in 1936 for the sole purpose of tracking the earnings histories of US workers. ERISA is a federal law that sets minimum standards for retirement plans in private industry. When the employee (who is not an underground mining employee) reaches the compulsory retirement age of 65 years, his employer may retire him and pay him. ADP offers industry-leading online payroll and HR solutions, plus tax, compliance, benefit administration and more. From equity to retirement to college savings, our solutions help employees achieve their financial goals, so they can take your company to new heights.