He Often Seems a Little Confused

(Yah, I know you don't want to know, but here's a link so you can secretly look at it.)
McCain is 71.

A group of 856 people age 71 years and older who were participating in the national Health and Retirement Study...

About 22% of the older people had cognitive impairment that did not reach the threshold for dementia. Applied to people age 71 years or older in the United States in 2002, 5.4 million older people had cognitive impairment without dementia. Annually, about 8% of those who had cognitive impairment without dementia died and about 12% progressed to dementia. 

Just sayin'.