The following chart outlines the requirements for an immediate annuity under the Federal Employees. Retirement System (FERS).If you want to apply for a deferred annuity, call the Office of Personnel Management (OPM) on 1-888-767-6738. If you have not reached your 20 years covered Law Enforcement or Fire Fighter service and reach the age 57, you must retire in the month you reach your 20 years. SERS normal retirement age is 65, 60, 55, or 50 depending on your class of service, which is listed on your annual member statements. In no event shall a retirement allowance be paid until the age of fifty-five years is attained. Reference to State Employees' Retirement System. B. Initial applications for retirement and related benefits must be submitted through the human resources office of the individual's employing agency. The Allegheny County Employees' Retirement System provides retirement, disability, and death benefits for employees and their beneficiaries. The Board of Pensions and Retirement manages the assets of the City's pension fund, ensuring there is enough money to pay out to those who have earned benefits.