Mo. Rev. Stat. § 476.455: All judges under nonpartisan plan eligible for retirement.

Any person having reached the age of sixty-five years, and having served an aggregate of twelve years continuously or otherwise as a judge of any of the courts whose judge or judges are required to be selected under the provisions of Section 29, Article V of the Constitution, shall have the same rights and privileges upon the same conditions as are provided for the judges and commissioners specified in section 476.450.