There's also "too old" in the sense of "too old to give a shit". I don't think my grandad "gets" me being trans, but he had definitely decided he is too old to care and was like "Okay, name, pronouns, got it, don't bother explaining" and proceeded to be the only family member who was perfect at it.

(It's actually kind of fascinating to see what language he comes up with on his own. Somehow, he has never learned what "transition" is and says things like "When he was being a girl..." which is simultaneously "getting it" and kind of cringe.)