Any member of the fire department who shall have been retired on or after January 21, 1925, or prior to January 1, 1900, and shall be receiving a pension on the eighth day of January, 1932, and any widow, child, children or parents of a deceased member of the department who shall be receiving a pension on the eighth day of January, 1932, shall continue to receive such pension subject to the provisions of Section 8.565 governing the payment of pensions to retired members, widows, children and parents. Any member of the fire department who shall have been retired on or after the first day of January, 1900, and prior to the 21st day of January, 1925, and shall be receiving a pension on the eighth day of January, 1932, shall continue to receive such pension throughout his life, subject to the provisions of Section 8.565 governing the payment of pensions granted because of disability incurred in the performance of duty, including the payment of such pension to widows, children and parents of deceased members who had been retired because of such disability. Such pensions shall be paid by the Retirement System, but no other benefits shall be provided for such retired members, widows, children or parents; except that upon the death of any such member who is receiving a pension under this section and regardless of the cause of death, a death benefit shall be paid to his estate or designated beneficiary, the amount of which shall be determined in the manner prescribed by the Board of Supervisors.