20 CFR 404.132: How we determine fully insured status for a period of disability or disability insurance benefits.

In determining if you are fully insured for purposes of paragraph (b), (c), (d), or (e) of § 404.130 on disability insured status, we use the fully insured status requirements in § 404.110, but apply the following rules in determining when the period of elapsed years ends:

(a) If you are a woman, or a man born after January 1, 1913, the period of elapsed years in § 404.110(b) used in determining the number of quarters of coverage (QCs) you need to be fully insured ends as of the earlier of—

(1) The year you become age 62; or

(2) The year in which—

(i) Your period of disability begins;

(ii) Your waiting period begins (see § 404.315(d)); or

(iii) You become entitled to disability insurance benefits (if you do not have to serve a waiting period).

(b) If you are a man born before January 2, 1913, the period of elapsed years in § 404.110(b) used in determining the number of QCs you need to be fully insured ends as of the earlier of—

(1) The year 1975; or

(2) The year specified in paragraph (a)(2) of this section.