Members of the Delinquency Prevention Commission shall be appointed by the Board of Supervisors, through the Rules Committee, to serve a term of four years, and they shall be reimbursed for their actual and necessary expenses incurred in the performance of their duties. The Commission shall have at least five members who have advanced degrees or at least five-years experience in: (1) law enforcement or criminal justice, (2) social services, (3) mental health, (4) education, and (5) physical health, respectively. At least two of the remaining members of the Commission shall be persons between the ages of 14 and 21 years of age. Upon a vacancy occurring in the membership of the Commission and upon the expiration in the term of office of any member a successor shall be appointed by the Board of Supervisors. When a vacancy occurs for any reason other than the expiration of a term of office, the appointee to fill such vacancy shall hold office for the unexpired term of his or her predecessor.