In cities, except Boston, which have accepted this section and section eighty-one B by vote of the city council subject to the provisions of the city charter, the appropriate retirement board, established under section twenty, shall retire from active service:

1. (a) Any fireman, call fireman or substitute call fireman who becomes permanently disabled, mentally or physically, by injuries sustained or illness incurred through no fault of his own in the actual performance of duty, from further performing duty as such member.
2. (b) Any permanent member of the fire department who has performed faithful service therein for not less than twenty years continuously, who becomes permanently incapacitated for further duty as such member before attaining the age of sixty.
3. (c) Any permanent member of said department, at his request, at any time after attaining the age of sixty and before attaining the age of sixty-five if he has performed faithful service therein for not less than twenty years continuously.

4. (d) Any permanent member of said department on attaining the age of sixty-five without any request on his part. No permanent member of said department shall remain in service after he has attained or shall attain the age of sixty-five.

   No fireman whose employment began after June thirtieth, nineteen hundred and thirty-seven shall be subject to the provisions of this section and section eighty-one B.

   The provisions of sections eighty and eighty-one, or of any special law authorizing the granting of non-contributory pensions to members of the fire department thereof, shall no longer apply in any city which accepts this section and section eighty-one B.