If your age plus your years of eligible service credit equal 80, you can retire under the "Rule of. 80. The State of Texas retirement plan is mandatory for most state agency employees and provides a lifetime annuity when they retire.Remember, to be eligible to retire your TMRS account, you need to have five (5) years of service at age 60 or 20 years of service at any age. There are two parts of the law that may affect your Social. Retiree Insurance Eligibility. Currently, eligible UT System retired employees can participate in medical, dental, vision and voluntary life insurance. You cannot contribute to TRS or ORP programs due to your retired status, but you are still eligible to contribute to the UTSaver Voluntary Retirement Programs. TMRS is a statewide retirement system that provides retirement, disability, and survivor benefits for employees of participating Texas cities. Official site of the U.S. Army Reserve, the federal military reserve forces of the United States. An official website of the United States government.