Was it like Alzheimer's or something...

we'll find out in an hour or so lol

*spoiler
Ive read it already and it does sound like one o.o

I don't think it's Alzheimer, cause to this day it doesn't have a cure and it only goes worse with time and he seems fine after more than 30 years.
I'm thinking that it was some kind of brain tumor.

That too.. but ouch he was robbed off a his whole life because of it ;((