Veterans in any sport walk a fine line. They're valuable in team building and useful for their experience, but oftentimes they wake up one day and are suddenly way too old and slow to compete at the highest level.
It's easier to hide in a team sport but almost impossible to avoid. In a sport where that veteran performs alone, there's never a doubt. When that performance has the potential to result in a concussive blow and years taken off one's life, it's even clearer.
Here are 10 veterans currently plying their trade in the Octagon who could be reaching the end of the road.