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Ah, interesting. I thought it might be referring to old and new versions of the cartoon. I thought I read somewhere that the earliest version had a tail.

Great riddle. Thanks for the clue!

The Mandela Effect?

“Martyr died before sentence was realized” refers to Mandela dying in jail (he didn’t)
“George” refers to Curious George having a tail or not? He didn’t, although it turns out...

83 isn’t bad. I’d take it.

I am in favour of any plan that involves bringing back Leonard Nimoy. I mean, in some rejuvenated form, ideally. I wouldn't want the poor man to suffer or anything.

Confirmation bias?

(Spoilerized as I just read a request in another thread to not reveal guesses to let others play).

I'm thinking "solipsism", but that doesn't capture the idea of misperception you've hinted at.

Out of body/near death experience?