#3 Christian
Retirement Year: 2014
Retired at: 40
Christian is one of the few men who found success both as a singles and a tag-team wrestler. A Grand Slam Champion with more than 15 title reigns to his name, Christian remains one of the most underrated babyfaces in the history of WWE.
For a good part of his career, Christian managed to remain relatively injury-free. After becoming a huge name in TNA, "Captain Charisma" returned to WWE and became an overnight sensation.
With a torn pectoral muscle, and ankle and shoulder problems, the injuries started amassing which kept him out of action for much of 2012 and 2013. A concussion that he suffered in a match in March of 2014 forced him to retire in the same year.
One of the most fan-favorite performers to ever step into the squared circle, Christian became yet another victim of a history of concussions and other injuries, which caused him to bid farewell to the WWE Universe.