28 U.S.C. § 4 : US Code - Section 4: Precedence of associate justices

Search 28 U.S.C. § 4 : US Code - Section 4: Precedence of associate justices

Associate justices shall have precedence according to the
seniority of their commissions. Justices whose commissions bear the
same date shall have precedence according to seniority in age.