dang i got lost at the math part-- is it possible for an infinitely long living person to remember only a finite number of facts? or does he hallucinate or develop meta facts about the facts he knows?

What seems to be missing is that the time to learn a new fact takes away from time available to remember old facts. So eventually you won’t be able to learn anything new because you have to spend your time remembering old facts.

(This also assumes humans have infinite brain capacity, which isn’t true.)