Athletes—particularly NFL athletes—don't always know when to call it quits.
Be it age or nagging injuries, most of them don't know anything else other than the sport they've played all their lives.
In our modern age we're living well into our 80s and 90s, and people in their 30s are still considered young.
However, in the NFL you're considered old once you've reached 30 and ancient if you make to 35 and are still on an active roster.
This list consists of 11 2011 free agents who may just hang it all up within the next two years.
Some will do it because they recognize their age and that their ability has slipped, so instead of being a shadow of their once-great selves they'll bow out.
Others will hang around too long and will only decide to call it quits because they'll feel disrespected by the lack of money they are offered.
And we have one more group, one that regardless of age, diminished talent, or lack of big contracts will hang around too long and their career might end on a stretcher.