The Retirement Agency shall conduct elections for eligible voters to select: Two trustees to serve on the Board of Trustees, one active member of the Employees' Systems and one active member of the Teachers' Systems, for a 4-year term to begin on August 1, 2021, and every 4 years after that; One trustee to serve on the Board of Trustees who is an active member or retiree of the State Police Retirement System, for a 4-year term to begin on August 1, 2022, and every 4 years after that; and Two trustees to serve on the Board of Trustees, one retiree of the Employees' Systems and one retiree of the Teachers' Systems, for a 4-year term to begin on August 1, 2023, and every 4 years after that. At each applicable election, eligible voters from: The Employees' Systems shall elect one trustee from the Employees' Systems; The State Police Retirement System shall elect one trustee from the State Police Retirement System; and The Teachers' Systems shall elect one trustee from the Teachers' Systems.