About every 3 weeks or so there is a picture in the newspaper of a car in a swimming pool or inside a 7/11 store usually driven by a senior citizen who just got the pedals wrong that day. None seem to be the result of sudden incapacitation. I bet if you asked each one of these drivers a few minutes before their mishaps if they have any problems with age and driving, they'd probably tell you to #$% off, and that they are ok to drive.
And no one under the age of 30 ever crashes their car. Oh no...
Maybe not from incapacitation but possibly inattention or over confidence or possibly even a lack of experience.