Statistically Speaking

Number of men named John who have served as Chief Justice: 4

Average age of Justices on the Roberts court: 67.7

Average age of Justices on the Rehnquist court: 71.1

Shortest tenure, in days, as Chief Justice (John Rutledge): 125

Average tenure, in days, of a Chief Justice: 4844

Longest tenure, in days, as Chief Justice (John Marshall): 12,542