Todd McClure turns 35 in February, but he still gets the job done. His skills could erode without warning, however, which is why I'm listing him at just three stars.
Will Montgomery, C/G, Redskins. Age: 29. Re-signed with Redskins (4 years)
Will Montgomery is a good fit in Mike Shanahan's scheme as a lineman who can play guard and center. He's worth more to the Redskins than most other teams, so he should re-sign with them.
Casey Wiegmann, C, Chiefs. Age: 39.
The Chiefs will welcomed back Casey Wiegmann if he still wants to play, but at 39, his performance could fall off at any point without warning.
Jason Brown, C/G, Rams. Age: 29.
Jason Brown was considered a top-tier free agent center in 2009 when he signed a 5-year, $37.5 million deal with the Rams. But like most players who go from a good team to an inferior organization solely for the money, Brown's performance really dropped off. He was benched last season. He's still young enough to turn his career around though, so he might be worth signing to an incentive-laden contract.
Jeff Faine, C, Buccaneers. Age: 31.
Jeff Faine has battled way too many injuries over the years. He managed to play in 15 contests last season, but he looked like a shell of his former self. Perhaps he can get healthy and rebound, but no one should hold their breath.
Mike Pollak, C/G, Colts. Age: 27. Signed with Panthers
Mike Pollak was in and out of the lineup in 2011 due to inconsistency, but he played well at times. He won't kill you if you have to start him at guard or center.
Dan Connolly, C, Patriots. Age: 29. -- Re-signed with Patriots
Scott Mruczkowski, C, Chargers. Age: 30.
Jamaal Jackson, C, Eagles. Age: 32. -- Announced retirement
The only trades I projected were ones that either already happened or ones that aren't motivated by draft picks. (Ex. I had the Pats getting an early second rounder for Jimmy G, but I won't have any trades where a team trades up only to select a player in the draft.