Oklahoma constitution
Article VII: judicial power
Section 11

(c) Notwithstanding the provisions of this Article relating to terms of office, the Legislature may provide by statute for a maximum age qualification for election or appointment to office and for the retirement of Justices and Judges automatically at a prescribed age or after a certain number of years of service, or both. The compensation, age of retirement and procedure for retirement shall be prescribed by statute. Any retired Justice or Judge may, in the discretion of the Supreme Court, be assigned to Judicial service. The compensation for such service shall be that to which the Justice or Judge is entitled in accordance with benefits as provided by statute.