#6 John Cena (Age - 27)
It would not be wrong to say that there's never been a WWE Superstar quite like John Cena. Debuting in 2002, Cena quickly won over fans with his rapper gimmick, and by late 2004, was the de facto number one face on SmackDown.
Despite being the final man eliminated in the 2005 Royal Rumble, Cena found his way into a WWE Championship match at WrestleMania 21 against John 'Bradshaw' Layfield.
Topping JBL at the Show of Shows, Cena won the title at the tender age of 27 and would have a lengthy reign that would see Cena be drafted to RAW in the process. After retaining the title against the likes of Chris Jericho and Kurt Angle, his near-year long reign came to an end when Edge cashed in the Money in the Bank briefcase for the first time ever at New Years Revolution in 2006.
Post a shocking title change, Cena would win the gold back a matter of weeks later at the Royal Rumble, and would go on to hold a World title 16 times in his career, equal only to the legendary Nature Boy Ric Flair.