Tenn. Code § 17-327
Any judge who retired under prior laws and who elected no optional benefit prior to retirement shall receive a normal retirement benefit. Any such judge who elected an optional benefit prior to retirement and his contingent annuitant shall receive an optional benefit based on a normal retirement benefit. The benefits shall commence when this chapter is adopted. Ages at termination of service shall be used in computing benefits.
No retired judge or contingent annuitant shall have any right impaired or benefit diminished by this section but shall be entitled to the right and benefit enjoyed under prior laws instead of the benefit provided for in this section if elected by notice to the board. This section shall not extend any benefits to others than a retired judge and his contingent annuitant receiving a benefit from this retirement system when this chapter is adopted.
T.C.A. § 17-327