#4 Finn Balor (WWE Debut in 2014)
The reigning WWE NXT Champion Finn Balor made his wrestling debut in 2000, at the age of 18, and since then has gone on to carve quite a successful career across the globe. Wrestling for NWA Ireland in his formative years, his WWE career has turned out to be immensely fruitful as he's consistently been near the top of the card, no matter which brand he's wrestling for.
Born in Bray, Ireland, he grew up a fan of in-ring technicians like The British Bulldog, Mr.Perfect, and Rick Rude. This influence is evident in his wrestling style, which comprises of traditional grappling along with some high-flying moves.
Honing his skills in New Japan Pro-Wrestling for over a decade, his WWE debut and eventual success have gone on to make him one of the most sought after WWE Superstars of current times. His Universal Championship win and Intercontinental Championship reigns on WWE RAW have made him a force to be reckoned with.
Considering he's 39 years old, his best years may not last for much longer, but he would surely look to make the best out of whatever's left in his arsenal.