For any foundation member, the term, reduction age, means the age at which the sum of the foundation member's age and credited service equals a number as follows: (1) For Class A credited service, an age not less than fifty-five and at which the sum of the foundation member's age and credited service equals eighty-five; (2) For Class B credited service as a justice, judge, or magistrate judge, an age not less than fifty-five and at which the sum of the foundation member's age and credited service equals eighty; and (3) For Class B credited service other than as a justice, judge, or magistrate judge, an age not less than forty-five and at which the sum of the foundation member's age and credited service equals seventy-five. Source: SL 2016, ch 32 , § 29; SDCL § 3-12-89.7 ; SL 2019, ch 22 , § 1.