If your age plus your years of eligible service credit equal 80, you can retire under the "Rule of. 80. 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.Health Benefits for Retirees. Beginning with the year in which you turn age 65, regardless of your employer. The MSRB administers the Massachusetts State Employees' Retirement System (MSERS) for state employees and certain other employees of public entities. This information applies to all active state employees. Health Benefits for Retirees. Receive retirement benefits from the outofstate public retirement system . The rules of computing this SCD are found in the Guide to Processing. Personnel Actions, Chapter 6.