Constitution of the State of Ohio Art. IV, § 6

(B) The judges of the supreme court, courts of appeals, courts of common pleas, and divisions thereof, and of all courts of record established by law, shall, at stated times, receive, for their services such compensation as may be provided by law, which shall not be diminished during their term of office.  The compensation of all judges of the supreme court, except that of the chief justice, shall be the same.  The compensation of all judges of the courts of appeals shall be the same.  Common pleas judges and judges of divisions thereof, and judges of all courts of record established by law shall receive such compensation as may be provided by law.  Judges shall receive no fees or perquisites, nor hold any other office of profit or trust, under the authority of this state, or of the United States.  All votes for any judge, for any elective office, except a judicial office, under the authority of this state, given by the general assembly, or the people shall be void.

(C) No person shall be elected or appointed to any judicial office if on or before the day when he shall assume the office and enter upon the discharge of its duties he shall have attained the age of seventy years.  Any voluntarily retired judge, or any judge who is retired under this section, may be assigned with his consent, by the chief justice or acting chief justice of the supreme court to active duty as a judge and while so serving shall receive the established compensation for such office, computed upon a per diem basis, in addition to any retirement benefits to which he may be entitled.  Laws may be passed providing retirement benefits for judges.