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If you consider how messed up the world of Fury Road is, it would have to take place a considerable amount of time after Beyond Thunderdome. In that case, I think Gibson's current age would've been appropriate for Fury Road. I liked that movie, but I think it would've been 100% better without Tom Hardy. He has no charisma at all, and I'm nearly convinced that he doesn't know how to talk properly. It could've been just about Furiosa, or if they needed Max to be in it, they could've cast nearly any Australian actor in the role and it would've been better (except Jai Courtney. That would be the one instance of making things worse haha).
I'd love for a future movie to reveal that Hardy is playing a character that just took over Max's identity (which would explain some inconsistencies in the movie) and the real Max is already dead or off somewhere else. I personally like the fan theory that the Fury Road Max is actually the Feral Child from the Road Warrior, but I doubt that'll make it into the film's canon.
Back to the main topic, I do believe that it's about time to give Mel Gibson another chance. What he said was 10 years ago, and he has since apologized for his behaviour and knows what he said was wrong. Would you like to be held accountable for every stupid thing you've ever said for your entire life, even while drunk or otherwise inebriated? How about everything you said as a child? Probably not. He's a good actor with a lot of screen presence, and I'd like to see him in more films. Maybe not as the leading man, but he does play a good villain.
Expendables 3 was a terrible movie, but Gibson was great in it. He was clearly having a lot of fun with the character, and was very entertaining to watch. I want to see him in more roles like that.