Ind. Code § 5-10-5.5-9
(b) An officer who becomes a participant after becoming fifty (50) years of age is required to retire on the earlier of:
(15) years of service.
Formerly: Acts 1972, P.L.1, SEC.1. As amended by P.L.38-1986, SEC.1; P.L.55-1987, SEC.1; P.L.55-1989, SEC.2; P.L.128-2008, SEC.2.