Section 49–135. A. No person shall be employed in a fire department who has reached the age of forty-five (45) years, unless it appears he or she shall become eligible for retirement at the age of sixty-five (65) years or unless he or she be retired from a municipal fire department in the State of Oklahoma this state. This section shall not apply to professional engineers, or to persons employed as technical specialists on a temporary basis. The State Oklahoma Firefighters Pension and Retirement Board shall be authorized to establish the maximum age, within the limits herein prescribed, over which an applicant may not be considered for initial employment, but no person shall be prohibited from making application for reemployment and having such reemployment application considered merely because of his or her age, provided that such person be under the age of forty-five (45) years, and provided further, that such reemployment shall be with the consent of the fire chief of such municipality.

B. On or after the effective date of this act November 1, 2015, a person who performs volunteer services as a firefighter, who has attained the age of forty-five (45) or more years as of the first date such volunteer services are performed, for a municipality or a county shall not be eligible to be a member of the Oklahoma Firefighters Pension and Retirement System for any purpose, shall not be eligible for any benefit payable by the System and shall not receive any form of service credit from the System resulting from such volunteer services. The person responsible for decisions regarding the performance of firefighting services having jurisdiction, which in the absence of any other requirement to the contrary shall be the Fire Chief fire chief, shall make the final determination on applicants for positions that would involve the performance of volunteer firefighting services if the applicant is over the age of forty-five (45) years based on local rules, regulations, ordinances, guidelines and standard operating procedures.

C. Notwithstanding the requirements of subsections C and H of Section 49–106.1 of this title to terminate employment with all participating municipalities as a firefighter, a person retired, paid firefighter receiving an accrued retirement benefit pursuant to Section 49–106 of this title may perform volunteer firefighting services for a volunteer department pursuant to subsection B of this section and continue to receive the member's accrued retirement benefit; provided,. A member performing services for a volunteer fire department under this section shall not further accrue any years of credited service during such period. Provided, that the pension shall cease during any period of time the member may thereafter serve for compensation in any municipal fire department in the state; provided further, that no person shall perform any services as a firefighter if such person is receiving disability benefits pursuant to Section 49–109 of this title.