Jimmy Kemspki provides us with a great master list of offensive line ages around the NFL:
Philly has the 13th oldest OL in the league, but their situation is a little odd, in that 4/5 of their line has very low mileage. Todd Herremans has 92 career regular season starts. The next highest total? Evan Mathis, with 37, or a little more than two full seasons worth of games.
This is one of those moments when you remember that even though the Eagles will start two sophomores in the interior line, Danny Watkins is only six months younger than 28-year-old tackle Demetress Bell.