12. Matt Schaub
At the age of 39, Schaub currently sits behind Matt Ryan in Atlanta, but there’s no shame in that. However, his decline from his best days with the Houston Texans is stark. He guided the Texans to the playoffs twice before falling off the bandwagon and failing to produce the same impact.
Since the Texans cut him, Schaub was never a regular starter again. He couldn’t get past Derek Carr in Oakland and was Joe Flacco’s backup in Baltimore. Overall, backup quarterbacks have one of the loneliest jobs in football because they know the chances of them playing are so slim.