http://www.democrats.com/mccain-owes-america-an-alzheimers-test
"Nor can we afford the risk of dementia. 22% of Americans over 70 are affected by mild cognitive impairment, while 13% of Americans over 65 have Alzheimer's. Ronald Reagan was diagnosed with Alzheimer's at age 83, but early signs were evident during his first term. Britain's "Iron Lady" Margaret Thatcher developed dementia at age 75.
Prescriptions can also adversely affect mental function. McCain takes Simvastatin, an arthritis drug that can cause memory loss. McCain also takes Ambien to sleep, which can cause amnesia and "fugue states" like the one that caused Rep. Patrick Kennedy's late-night car crash. If the phone rang at 3 a.m., would McCain even wake up? "
"John McCain owes America a thorough test for Alzheimer's and cognitive impairment long before Election Day."