The county executive shall appoint nineteen persons to serve without compensation on an advisory board for the department of senior services to advise on matters relating to senior citizens in the county. The board shall include not less than ten members who are Erie county residents, sixty two years of age or older. Membership shall be proportionately representative of the geographical areas within Erie county. The term of office of members of the board shall be two years. Officers of the board shall be selected by the membership thereof. Members of the board shall include, but not be limited to, representatives of the council of senior citizens clubs of Buffalo and Erie county, inc., and of the retired senior volunteer program.