The NFL is a grown man's league, but it's also undeniably a young man's league.
While it's not unheard of for players to play effectively into their mid-30's and beyond (yes, even the guys who actually get hit every now and then), it's certainly more of an anomaly in football than it is in some of the other major North American sports like baseball.
The inherently physical nature of the game takes its toll on the body quicker, and drop-offs are more sudden and acute. As we approach the end of this topsy-turvy 2010 campaign, here's a look at some of the household names that are starting to reach their twilight years, as well as a glimpse forward into the future.
The 2011 draft prospects named here might not-quite-yet be household names, but they might eventually take the places of some of these grizzled veterans in the years to come.