Despite a 1,000-yard rushing season at age 33, Peterson could struggle once again to find work in a tough running back market.

Father Time has seemingly caught up to the 38-year-old Peppers, who's recorded just four sacks in 15 games this season.

With one of the NFL's worst rosters, the Cardinals may have a tough time convincing their 11-time Pro Bowler to return for a 16th season.

The five-time Pro Bowler already announced he'll retire after Week 17. He nearly rode off into the sunset last year after finally tasting the playoffs.

The former Packers star doesn't seem to have much left in the tank and may become a cap casualty for the Raiders after one season.

The oldest active player in the NFL just turned 46. The Colts can extend his career by at least one week if they make the playoffs.

Davis has spent his entire 14-year career in Carolina, but he's openly questioned whether the Panthers want him back next season.

The Eagles are a doubt to make the playoffs, and their longtime left tackle could be ready to hang up his laces given all the injuries he's incurred. 

Once a feared pass-rusher, Wake has seen his role reduced over the last couple of seasons. The pending free agent will turn 37 in January.

Matthews has been in decline for a while and could struggle to generate interest on the free-agent market.

Long may call it quits if the Eagles miss the playoffs, but he's produced well enough at 33 to earn another contract if he wants one.

Williams has bounced around the league in recent years and is on the verge of completing his first season without an interception.