We all fear dementia. And the puzzling question is how will we know? One way docs use is the Mini-Mental exam — a 30-question assessment aimed at finding missing pieces in the aging brain.

Some people speculate that famous people don't get the same medical treatment as you and I do.

On a blistering Sunday morning following an 8-mile training run, I was sweaty, winding down, and heading for home when a car slowly came...