Confession: I had forgotten he was still alive (probably conflating him erroneously with Brian Epstein). He'd been out of the limelight in the U.S. for so long.
Of course, he could've easily called it a day after Abbey Road and never would've had to work a day again. But I see that after the Beatles he worked with a number of artists, including McCartney, America, and the Little River Band among others, and produced a few James Bond themes as well.
His greatness in the Beatle universe is unquestioned, though the title of "fifth Beatle" could go to any of a handful of others and Lennon wasn't fond of him.
RIP, Sir George.