My dad has always been a massive introvert, but at 85 he is really withdrawing from everything. We three direct kids of his are kind of used to being ignored, but he adores his grand- and great-grandkids but is no longer responding to their attempts to contact him. He no longer answers his phone, responds to texts or emails, or anything like that. He does occasionally send out a birthday card. He has decided to give up his car (NEVER thought that would happen). Alarmingly, he has not filed his federal taxes this year (not sure if he has paid and just not filed, or what).
We lost Mom at 72 years of age twelve years ago, but he grieved normally (for him) and returned to his normal self pretty quickly. His only sibling has come down with dementia, so there's that. No other dementia in the family thus far. When we do see Dad in person, he seems quiet but normal. His memory seems fine and he is in relatively great physical shape. He lives alone in a single apartment in a wonderful independent living home and is taking care of himself. His appetite is normal.
Maybe this is normal for this stage in life, but we are worried and unsure of what to do (or if anything needs to be done). There's no way we could get him to go to the doctor to get checked out, let alone talk to a psychiatrist or a specialist in gerontology. Just isn't going to happen.
Not sure how to proceed here. Any advice would be appreciated.