13. Mickey Rourke
This veteran actor has proved that age is just a number. Mickey Rourke underwent a rigorous training regime to fit his character in The Wrestler. Although, Rourke had a previous professional boxing career, yet his acting career did not help him maintain that figure for long. However, when he decided to play the role of “Randy”, Rourke fully dedicated himself to building his body as a professional wrestler. He also took training from real-life professional wrestlers for getting into the right shape.