I imagine that senility must hit a guy like Joe hard. He has lied all his life and now has trouble remembering things that happened vs things he made up.
I used to be a liar when I was 21.
I made a fool of myself by being unable to remember lies told and to whom, and I had at least a decently sharp memory back then.
At that time, I decided that I would no longer dishonor myself this way, and I determined that truth is the only thing that matters, everything else is a waste of time.
Seeing Joe at his age still being a liar tells me that he never had to confront this behavior in himself. He’s never been called on it. Only excuses made for him, much like his perverted behavior with children and women.
This man has lived his entire life having learned nothing from himself or of himself. He is oblivious to his own dark side, and that makes him dangerous.