Every individual who—
(1) is entitled to hospital insurance benefits under part A, or
(2) has attained age 65 and is a resident of the United States, and is either (A) a citizen or (B) an alien lawfully admitted for permanent residence who has resided in the United States continuously during the 5 years immediately preceding the month in which he applies for enrollment under this part,
(Aug. 14, 1935, ch. 531, title XVIII, § 1836, as added Pub. L. 89–97, title I, § 102(a), July 30, 1965, 79 Stat. 304; amended Pub. L. 92–603, title II, § 201(c)(1), Oct. 30, 1972, 86 Stat. 1372.)