Draft eligible players catch a lot of grief for being (gasp) over 22 years of age. Meanwhile players 21 and under are celebrated as prospects ("all this and he's still just 21 years old!"). It's because of this emphasis on getting young(er) talent that's supposedly on the upswing that the age of drafted players is tracked.

As soon as the draft is over, the race for undrafted free agents will begin for the 32 NFL teams. Really, it has already started. Teams are already discussing UDFA deals with players in case they are not drafted.