Mass. Gen. Laws ch. 260 § 33
A power of sale in any mortgage of real estate shall not be exercised and an entry shall not be made nor possession taken nor proceeding begun for foreclosure of any such mortgage after the expiration of, in the case of a mortgage in which no term of the mortgage is stated, 35 years from the recording of the mortgage or, in the case of a mortgage in which the term or maturity date of the mortgage is stated, 5 years from the expiration of the term or from the maturity date, unless an extension of the mortgage, or an acknowledgment or affidavit that the mortgage is not satisfied, is recorded before the expiration of such period. In case an extension of the mortgage or the acknowledgment or affidavit is so recorded, the period shall continue until 5 years shall have elapsed during which there is not recorded any further extension of the mortgage or acknowledgment or affidavit that the mortgage is not satisfied. The period shall not be extended by reason of non-residence or disability of any person interested in the mortgage or the real estate, or by any partial payment, agreement, extension, acknowledgment, affidavit or other action not meeting the requirements of this section and sections 34 and 35. Upon the expiration of the period provided herein, the mortgage shall be considered discharged for all purposes without the necessity of further action by the owner of the equity of redemption or any other persons having an interest in the mortgaged property and, in the case of registered land, upon the payment of the fee for the recording of a discharge, the mortgage shall be marked as discharged on the relevant memorandum of encumbrances in the same manner as for any other mortgage duly discharged.
Mass. Gen. Laws ch. 260, § 33