All pensions which were payable under chapter five hundred and three of the acts of nineteen hundred and twelve or chapter six hundred and seventy-one of the acts of nineteen hundred and thirteen by any city or town to former employees of a fire or water district therein which accepted chapter three hundred and fifty-two of the acts of nineteen hundred and fourteen at the annual meeting of the district held next after the passage thereof, shall be paid by the district.
Mass. Gen. Laws ch. 32, § 79