Palpatine was a clone according to Rise of Skywalker novelization.
https://screenrant.com/star-wars-palpatine-clone-rise-skywalker-confirm-novel/
Funny. This completely contradicts the TROS Star Wars visual dictionary that says Palpatine was kept alive by Sith occultists after ROTJ.
It seems Disney can't decide what is canon and what is not. But retconing is what they're best at right?