I agree - it does sound like Alzheimer's but, according to his wife, the doctors say he doesn't have it. He does have very bad hearing and should be on an oxygen tank but he's very stubborn and won't get one. The moments of disorientation may be related to an oxygen deficiency. This may just be regular garden variety senility (or C.R.S. as my mother calls it).
He has always been such a good neighbor. He and his wife pretty much raised their oldest granddaughter, who is a year younger than I am. The granddaughter and I were best friends when we were little. He is a Pearl Harbor veteran and just a really nice man. His wife is frantic.
His children are going all over the area putting up flyers. He's been gone for over 12 hours now.