For purposes of applying the provisions of paragraph (1), a determination shall be made under paragraph (2) for each year, beginning with 1972, of the total number of an individual’s increment months through the year for which the determination is made and the total so determined shall be applicable to such individual’s old-age insurance benefits beginning with benefits for January of the year following the year for which such determination is made; except that the total number applicable in the case of an individual who attains age 70 after 1972 shall be determined through the month before the month in which he attains such age and shall be applicable to his old-age insurance benefit beginning with the month in which he attains such age.
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