Members eligible for the alternative formula may retire at age 50 with 25 years of service, or at age 55 with 20 years of service. To be eligible for a TRS retirement annuity, the Illinois Pension Code requires you to terminate active service as a teacher.Early retirement​​ You can receive Social Security retirement benefits as early as age 62. When should I file my application for retirement? SURS would like to receive your application 60-90 days prior to your effective date of retirement. Who is eligible to receive a SURS retirement benefit? If you have not met the age requirement, you may leave your funds on file until you become eligible for retirement benefits. Early retirement benefits will continue to be available at age 62, but they will be reduced more. However, plans may allow employees to begin participation before reaching age 21 or completing one year of service.