Every parent (as defined in this subsection) of an individual who died a fully insured individual, if such parent—

(A) has attained age 62,

(B) (i) was receiving at least one-half of his support from such individual at the time of such individual’s death or, if such individual had a period of disability which did not end prior to the month in which he died, at the time such period began or at the time of such death, and (ii) filed proof of such support within two years after the date of such death, or, if such individual had such a period of disability, within two years after the month in which such individual filed application with respect to such period of disability or two years after the date of such death, as the case may be,

(C) has not married since such individual’s death,

(D) is not entitled to old-age insurance benefits, or is entitled to old-age insurance benefits each of which is less than 82½ percent of the primary insurance amount of such deceased individual if the amount of the parent’s insurance benefit for such month is determinable under paragraph (2)(A) (or 75 percent of such primary insurance amount in any other case), and

(E) has filed application for parent’s insurance benefits,

shall be entitled to a parent’s insurance benefit for each month beginning with the first month after August 1950 in which such parent becomes so entitled to such parent’s insurance benefits and ending with the month preceding the first month in which any of the following occurs: such parent dies, marries, or becomes entitled to an old-age insurance benefit equal to or exceeding 82½ percent of the primary insurance amount of such deceased individual if the amount of the parent’s insurance benefit for such month is determinable under paragraph (2)(A) (or 75 percent of such primary insurance amount in any other case).