Any city having a population of not less than one hundred twenty thousand (120,000) nor more than two hundred thousand (200,000) is hereby authorized to provide funds for the pensioning of all elective and appointive city officers and employees other than members of the police department, fire department, water and light department, and all day laborers not paid on a monthly basis and any officer or employee who elects not to come under the provisions of this act.
K.S.A. 13-1497