For the full retirement benefit, you must be 62 years old at retirement or, if you have 30 years of credited service, you may retire as early as age 55. With 20 years of service credit, you can apply for early retirement regardless of your age.The following is a summary of rules for a service retirement benefit, which can vary based on your tier, age, earnings and service credit. You can receive Social Security retirement benefits as early as age 62. The full retirement age can range from 55 to 63, although police and firefighters may be eligible to retire even earlier. The employer must demonstrate that there is an urgent need for your services or that there are no available, qualified non-retired persons to fill the position. "Early retirement age" shall mean age fifty-five, for general members, and the age on which a member completes or would have completed twenty years of service. If you chose to leave public employment, you would be able to apply for a vested retirement benefit once you turn 55. Early retirement benefits will continue to be available at age 62, but they will be reduced more. If you leave covered employment before reaching retirement age, you may be eligible for a Deferred Pension.