(i) reduced by five-ninths of one percent for each month, or part thereof, that separation from service upon retirement (or the date benefits commence, if later) precedes attainment of age sixty-five, provided that such reduction, in no event, shall exceed twenty percent, or

(ii) increased by one-twelfth of one percent for each month that separation from service upon retirement exceeds attainment of age sixty-five. e. Except as otherwise provided herein, a member's primary insurance amount shall be determined as provided in the federal social security act, and the rules and regulations promulgated thereunder. f. This section shall not apply to general members in the uniformed correction force of the New York city department of correction or to uniformed personnel in institutions under the jurisdiction of the department of corrections and community supervision and security hospital treatment assistants, as those terms are defined in subdivision i of section eighty-nine of this chapter, provided, however, that the provisions of this section shall apply to a New York city uniformed correction/sanitation revised plan member. g. This section shall not apply to a New York city enhanced plan member who receives the ordinary disability benefit provided for in subdivision c-1 of section five hundred six of this article or the accidental disability benefit provided for in paragraph three of subdivision c of section five hundred seven of this article.