; or (ii) an alien lawfully admitted for permanent residence. (C) The individual is not otherwise entitled to benefits under part A or eligible to enroll under part A or part B. (D) The individual has attained the applicable years of age but has not attained 65 years of age. (4) Applicable years of age defined For purposes of this section, the term applicable years of age means— (A) effective January 1 of the first year following the date of enactment of the Medicare for All Act of 2017 , the age of 55; (B) effective January 1 of the second year following such date of enactment, the age of 45; and (C) effective January 1 of the third year following such date of enactment, the age of 35. (b) Enrollment