There is only my Dad and DP's Dad left.
Both are pretty obviously ASD - self absorbed, one track mind, gotta stick to routine or their worlds fall apart.
DP's Dad is still very active, out and about doing his hobby (not cycling!) and whilst he won't listen to anyone else at least he tends to have new stories every few weeks - they all centre around how awesome he is at his hobby (and to be fair, he is talented) and how everyone thinks he's great... but at least its new news.
My Dad - having just escaped hospital and returned home when we did not think he would... is a billion times worse than when he went in, he's had people waiting on him hand and foot and now is even more firmly entrenched in the idea that everyone else has nothing to do but entertain him.
He does nothing - TV (reruns of Last of the Summer Wine and Steptoe), Radio (reruns of Hancocks Half Hour and Round the Horne) - goes nowhere but the pub - doesn't LISTEN to anyone and takes zero interest in what anyone is doing...
As a result, he has absolutely fuck all to talk about, but wants to drone on and on, and also wants us to amuse him - no discussion of anything depressing or worrying though! (He totally blanked my sisters heart surgery back in january, pretends I only use a wheelchair because I am lazy.)
He moans on and on that his life is miserable - which it frankly is, but refuses to do anything to help himself whatsoever. I am aware he has dementia but it is at this point just exacerbating personality traits he has always had (he's a toddler in an old mans body and emotionally never got past the age of about 6! His tantrums are legendary amongst those who have known him the better part of his 84 years!)
My patience is wearing extremely thin and it is getting very hard not to be resentful and nasty when he asks for help... All I can think of is 'where were you when I was 16 and begging for your help?' (Home alone when my Mother was sectioned for 6 weeks. Penniless at a residential college local to him, no money for food or laundry. He just said 'well you're your mothers problem, I look after your sister' and that was that!)
But there is nothing to be achieved by throwing that lot at him, he won't remember, if he does he will just tell himself it didn't happen, I am over dramatic, and even if it DID register that he had behaved appallingly, all it would do is make him feel awful and that wouldn't benefit me remotely. The frank and heartfelt apology 'I was wrong and I should not have done that, I am sorry' is never coming.
Sorry that seems rather doom-filled, I don't believe for a second that everyone gets that way when they get older - my partner does some manual jobs for a lady in her 90s and she is an absolute treat. Social, interested in things beyond her personal experiences, funny, kind (and he is basically the 'lad who does maintenance' to her, nothing more).