Massachusetts Constitution Pt. 2, Ch. III, Art. 1

ART. I. The tenure, that all commission officers shall by law have in their offices, shall be expressed in their respective commissions. All judicial officers, duly appointed, commissioned and sworn, shall hold their offices during good behavior, excepting such concerning whom there is different provision made in this Constitution; provided, nevertheless, the governor, with the consent of the council, may remove them upon the address of both houses of the legislature; and provided, also, that the governor, with the consent of the council, may after due notice and hearing retire them because of advanced age or mental or physical disability; and provided further, that upon attaining seventy years of age said judges shall be retired. Such retirement shall be subject to any provisions made by law as to pensions or allowances payable to such officers upon their voluntary retirement.