Heath Ledger is the youngest actor to have played The Joker. There have been numerous Jokers as the years have gone on.

Jack Nicholson: Batman (1989); Cesar Romero: Batman: The Movie (1966); Jared Leto: Suicide Squad (2016) are the most notable to me. However, I’m not a professional in all things Joker. So, don’t judge me too harshly.

Given that these actors were over 40 years old when they play the infamous comic book character, I’d say Heath Ledger more than proved himself (at around the age of 28 years old) as a top contender; moreover, much deserved praise for his portrayal. I would also like to put out there that I think it’s quite commendable that he didn’t take the easy route and try and emulate previous Jokers. He took it upon himself to bring a whole new take. I would say it certainly paid off.