Well, unless they saved his brain...
Brains age too, and old Adolf's one wasn't in good condition to start with. I read somewhere that the drugs that his private doctor was injecting him with were into the realm of "
why would
anyone put
that stuff into a human body?"
My own take on the topic is that the story piles one improbability on top of another:
1) Hitler secretly escapes to South America. Okay, maaaybe.
2) Hitler secretly escapes to South America, and brings his private art collection along too???
3) Hitler does 1 and 2, and then... spends the rest of his life pretending to be a Roman Catholic priest???