My father is 86, he lives across the street with my mother, who is 83. They are self sufficient and both still drive, though my dad has limited himself. My dad though is forgetful, gets confused, especially about medical issues, what happened when and forgetful of taking his meds. He is angry about his state of confusion and loss of thought when in conversations. He can be very rude and always thinks he is right no matter the circumstance. He can be very rude and ugly to my mother, she gets the brunt of it. When we have brought up going to the doctor to check on his mental state, his answer is, "no, I am just old and there is nothing they can do about it anyway." How do I get him tested to see whether or not he has s ome type of dementia or is this just old age.