While most of us can't wait for retirement to come, the same can't be said for professional athletes. As we've seen, they do nearly everything they can to stay in the game for as long as possible.
Unfortunately, certain factors come into play.
It might be Father Time catching up to a player's body, forcing diminished play. Or maybe the team doesn't want him back because of injury concerns or a conflict with his contract.
Due to that, many of our favorite athletes have been forced off their teams rather than calling the shot on when to walk away from them—as Mariano Rivera and Andy Pettitte both did.
So while these 18 guys wish they could have played with their teams forever, their front offices just wouldn't allow it, forcing them out and into either retirement or signing elsewhere.