Top Hill aides range in age from 25 to 73. The average age is 43, one year younger than it was in 2007. The average age for Democratic staffers is 44; for Republican staffers, 42. Click on a tab to see information about other age groups.
This graphic is part of National Journal's special Hill People issue. Every four years, National Journal devotes an entire magazine to profiling top congressional staffers, many of whom toil behind the scenes in relative anonymity.