In the case of any individual who attains the age of 72 before 1969 but who does not meet the requirements of section 414(a) of this title, the 6 quarters of coverage referred to in paragraph (1) of section 414(a) of this title shall, instead, be 3 quarters of coverage for purposes of determining entitlement of such individual to benefits under section 402(a) of this title, and of the spouse to benefits under section 402(b) or section 402(c) of this title, but, in the case of such spouse, only if he or she attains the age of 72 before 1969 and only with respect to spouse’s insurance benefits under section 402(b) or section 402(c) of this title for and after the month in which he or she attains such age. For each month before the month in which any such individual meets the requirements of section 414(a) of this title, the amount of the old-age insurance benefit shall, notwithstanding the provisions of section 402(a) of this title, be the larger of $64.40 or the amount most recently established in lieu thereof under section 415(i) of this title and the amount of the spouse’s insurance benefit of the spouse shall, notwithstanding the provisions of section 402(b) or section 402(c) of this title, be the larger of $32.20 or the amount most recently established in lieu thereof under section 415(i) of this title.