#6. Former WWE Champion AJ Styles - 43-years-old
AJ Styles is one of the few current WWE Superstars who was able to make a name for himself outside of Vince McMahon's company before he was signed. Styles was a star in IMPACT Wrestling and NJPW before making his debut in WWE as part of the 2016 Royal Rumble.
Over the past few years, Styles has gone on to become one of the biggest stars in the company and is already a former two-time world champion. Styles' experience in the ring before he came to WWE is the reason why he has been part of the company for just five years despite his age.
#5. Former WWE Champion Sheamus - 43-years-old
Sheamus has been part of WWE since making his debut in ECW back in 2009. The Irish star has since been able to become a world champion four times over the past decade.
Whilst Sheamus's career has been hit by injuries, the star is still able to fight back to the main event level of the company. He was recently a part of the WWE Championship picture. Sheamus is currently set to fight Riddle for the United States Championship at WrestleMania next weekend.