What is wrong with John McCain? He seems like an okay guy...?

This is not a personal jab at the man but I'm starting to get worried. He doesn't seem as though he's mentally there all the time. They say that 73-75 is the average starting age of Alzheimer's. Why shouldn't we ume that he is approaching that threshold? Oh, and why does Cindy stand in the backdrop looking dazed and confused---a little baked too? I thought she kicked her addiction...