To elect, by two-thirds favorable vote, by ballot, an elder to the office of district superintendent, to serve until 30 days following the final adjournment of the second district assembly following his or her election and until a successor is elected or appointed and qualified. The procedure for reelection of a district superintendent shall be by a “yes” or “no” ballot vote. No elder shall be considered eligible for election to this office who has at any time surrendered his or her credential for disciplinary reasons. No superintendent shall be elected or reelected following his or her 70th birthday.