Mo. Rev. Stat. § 56.814: Retirement age, creditable service required for normal annuity.

1. Any person who became a member prior to January 1, 2019, who has attained the age of sixty-two years and who has twelve years or more of creditable service as prosecuting attorney or circuit attorney may retire with a normal annuity as determined in subsection 3 of section 56.840.

2. Any person who becomes a member on or after January 1, 2019, who has attained the age of sixty-five and who has twelve years or more of creditable service as a prosecuting attorney or circuit attorney may retire with a normal annuity.