Three appointments made, three appointments canceled, and the same sentence every time: there is nothing wrong with me. Getting a person who may have dementia in front of a doctor is its own skill, and it starts with giving up the argument you have been losing, since the goal was never to make him admit something. The goal is a checkup.
Before you make the fourth appointment, notice what is rising in you, whether it is fear of what the doctor will find or fury that he will not see what is plain to everyone else. That is yours, it is normal, and it is worth one breath before you pick up the phone.
Before you read the refusal as the disease talking, check the ordinary barriers, since a hearing loss that makes phone calls humiliating, a bad experience at the last visit, worry about cost, or dread of the drive can each look exactly like stubbornness, and each has its own fix.
You do not have to figure out which of these is his. Both respond to the same move, which is making the visit smaller than the fear. That is what the yearly Medicare checkup offers. It is free, everyone his age gets one, and the brief memory screen inside it is standard procedure, so nobody has to raise the subject at all. Be clear with yourself about what it is: a screen is a doorway, not a diagnosis, and a full evaluation would come later and gently. But the visit can also carry good news, since thyroid problems, vitamin deficiencies, medication effects, depression, and bad sleep can all masquerade as memory trouble, and every one of those is treatable. You are not taking him in to be sentenced. You are taking him in to find out, and finding out sometimes clears him.
Print the one-page log if you want somewhere to keep this, and take it to the appointment.
This is what the tracking is for. A dated list of specifics turns your worry into something a doctor can act on, whether or not he ever agrees to the visit.
He does not have to agree that something is wrong for the visit to happen. The calendar supplies the reason, the doctor supplies the screen, and you supply the note. Your job was never to win the argument, only to get him through the door.