California Code, Government Code - GOV § 31662.8

Every safety member holding an elective office shall be retired at the end of the first term to which he or she is elected which expires on the date following his or her seventieth birthday, except that if the term expires within two years after the date on which a retirement system becomes operative or prior to January 1, 1954, whichever is later, he or she shall be retired at the end of the next term to which he or she is elected.

This section shall not be operative in any county until such time as the board of supervisors shall, by resolution adopted by a majority vote, make this section applicable in the county.