The information provided in this guide will serve as a resource tool for you as you prepare to select the best benefit choices for you and your family. Who is eligible for TSAP?Explore Medicaid eligibility, benefits, and application guidance. Understand its impact on retirement planning. Who Can Apply for Medicare Benefits in San Antonio? All retirees are eligible to enroll in Plan C; however, only those who are under age 65 may enroll in the Health. Social Security​ benefits are available at age 62 or older. Medicare Part A Costs: Medicare Part A coverage is free for most seniors. Retirees may continue coverage for dependents who were enrolled in the plan as of the date of retirement. UTSA offers a competitive retiree benefits package for eligible employees.