For purposes of this subsection, the “adjusted reduction period” for an individual’s old-age, wife’s, husband’s, widow’s, or widower’s insurance benefit is the reduction period prescribed in paragraph (6) for such benefit, excluding—

(A) any month in which such benefit was subject to deductions under section 403(b), 403(c)(1), 403(d)(1), or 422(b) of this title,

(B) in the case of wife’s or husband’s insurance benefits, any month in which such individual had in his or her care (individually or jointly with the person on whose wages and self-employment income such benefit is based) a child of such person entitled to child’s insurance benefits,

(C) in the case of wife’s or husband’s insurance benefits, any month for which such individual was not entitled to such benefits because of the occurrence of an event that terminated her or his entitlement to such benefits,

(D) in the case of widow’s or widower’s insurance benefits, any month in which the reduction in the amount of such benefit was determined under paragraph (5)(D),

(E) in the case of widow’s or widower’s insurance benefits, any month before the month in which she or he attained age 62, and also for any later month before the month in which she or he attained retirement age, for which she or he was not entitled to such benefit because of the occurrence of an event that terminated her or his entitlement to such benefits, and

(F) in the case of old-age insurance benefits, any month for which such individual was entitled to a disability insurance benefit.