I am dealing with this right now with my 88 year old dad. He lives alone. He repeats, he forgets, he's lost most of his social skills and I could go on.
It is not normal aging. His doctor has confirmed this. We have said the words to dad..told him what he has. He's aware that he is very forgetful but I really don't think he's but two and two together. He was on some meds but they gave him nightmares and he actually seemed worse so he's no longer on them. Besides, they only claim "maybe" they can slow it down but it can't be stopped. Donepezil (Aricept) and Memantine (Namenda)
He still maintains his home but we've recently been forced to take away his driver's license. That was NOT pretty. He fixes breakfast and does laundry and such but has a housekeeper twice a month although that has developed into more of a social event than any actual cleaning going on but that's another story.
I don't have an answer and I don't think there is one. I am currently looking into TCM Traditional Chinese Medicine- acupuncture, herbs, anything and everything. I'm on the fence as far as how much I believe this can help but I *know* western medicine is a dead end.
I wish I had better news.