Taxi Driver did it better. Totally overhyped film, still good, but not great or Oscar worthy at all.

The ending is amazing. But the audience feels sorry for him throughout, he's a goof, I don't see how this man became The Joker, the arch-villain. And yeah, he'd be 70 once Bruce Wayne started becoming Batman.

Edit: Also, he's basically the leader of Antifa. It's totally not self aware or red-pilled at all.