; (4) in subsection (c)— (A) in the matter preceding paragraph (1) by inserting Requirements for senior judge ; (B) in paragraph (1)— (i) by striking Any and inserting A ; and (ii) by striking this section may elect to become a senior judge of the court upon which he served before retiring. and inserting subsection (a) or (b), with 15 years or more of judicial service (whether continuous or otherwise), may elect to become a senior judge of the court upon which the judge served before retiring. Any judge or former judge who is receiving an annuity pursuant to subsection (b), with less than 15 years of judicial service (whether continuous or otherwise), may elect to become a senior judge of the court upon which the judge served before retiring upon attaining the age of sixty-five years. ; (C) in paragraph (2), by striking he and inserting the judge ; (D) in paragraph (3), by striking he and inserting the senior judge ; (E) in paragraph (4)— (i) by striking Any and inserting A ; and (ii) by striking subsection (a) of this section and inserting subsection (a) or (b) ; and (F) in paragraph (5), by striking Any and inserting A ; (5) in subsection (d), by striking Any and inserting Employment of senior judge— A ; (6) in subsection (f), by striking Service and inserting Computation of aggregate judicial service— Service ; (7) in subsection (e)— (A) by striking Any and inserting Mental or physical disability— A ; (B) by striking who is removed by the President of the United States and inserting who has served at least five years (whether continuous or otherwise) and who retires or is removed from office ; (C) by striking or who is not reappointed (as judge of such court),