Members can retire with a lifetime benefit as early as age 50 once they have acquired 5 years of service credits. By submitting your paperwork early, your personnel and payroll offices can complete their actions as soon as possible after your retirement date.COPERS is a defined benefit plan, qualified under the Internal Revenue Service ("IRS") rules. The following chart outlines the requirements for an immediate annuity under the Federal Employees. Retirement System (FERS). Any questions regarding PEHP should be directed to Nationwide at (602) 26653 or tollfree at 1(800) 8914749. PSPRS administers retirement benefits in the Defined Benefit Plan (DB Plan), wherein retirement benefit payments are determined. Pension is payable on retirement after attaining the age of compulsory retirement (superannuation) or in advance of this age under certain circumstances. Employees must complete Arizona Form A-4C and provide it to the employer. The monthly benefit for early retirement is less than the monthly benefit for full retirement.