• Within three years of retirement, ASRS members can register to attend the Route 3: Destination in Sight group meeting or online. You must work at least 20 hours per week to be benefits-eligible.• PSPRS return to work retirees: contact. Members can retire with a lifetime benefit as early as age 50 once they have acquired 5 years of service credits. Step 1: Learn the calculation. The formula to calculate a retirement is quite simple. Pension is payable on retirement after attaining the age of compulsory retirement (superannuation) or in advance of this age under certain circumstances. Find out how you can get help finding employment. 137 What is the Federal. Employee Retirement.