Older actors playing their younger selves is becoming rather common these days, but none of those movies have done what Gemini Man is doing.
Directed by Ang Lee, Gemini Man is about a deadly assassin being hunted by another deadly assassin. It just so happens, though, that the hunter and prey are the same person separated by a few decades. Both roles are played by Will Smith but Smith isn’t digitally de-aged to play his younger self. It’s a completely digital character. Full replacement. And, in the new trailer for Gemini Man, you can see that the line between what’s real and fake is getting blurry.