 The average age of the Court as a whole fluctuates over time with the departure of older justices and the appointment of younger people to fill their seats . The average age of the Court is 70 years , 7 months . Just prior to the death of Chief Justice Rehnquist in September 2005 , the average age was 71 . After Sonia Sotomayor was appointed in August 2009 , the average age at which current justices were appointed was about 53 years old . 
