#9 AJ Styles - 42
AJ Styles is widely regarded as one of the best wrestlers in the world today. He was the biggest star in TNA/Impact Wrestling before he departed. Styles increased his star power with a brief run on the independent scene, as well as with a run in New Japan Pro-Wrestling. In NJPW, Styles won the IWGP Heavyweight Championship, something that not many gaijin manage to do in Japan.
That run finally earned Styles a long overdue deal with WWE. What has Styles done during his time in WWE since 2016? He's continued to add to his legacy as one of the greatest of all time. In WWE, 'The Phenomenal One' has captured both the WWE Championship and the United States Championship twice.
Most of those title wins occurred while he was over the age of 40. Although Styles has already seen his 40th birthday, he still moves around the ropes and the ring like Ali and other high flyers in the business.
He's likely to slow things down in the future due to a desire to spend more time with his family. Until the day he hangs things up, however, 'The Phenomenal One' will be one of the top stars in professional wrestling regardless of age.