I am far more concerned about McCain's computer illiteracy than I am his age.
On the one hand, the huge number of Americans who are still basically illiterate when it comes to computers will probably keep this from being his "grocery scanner" moment.
Be that as it may, he should be computer literate because the trials and tribulations of using a computer clearly demonstrate the anti-consumer, manipulative nature of Microsoft, Comcast, and the other monopolies who screw their users daily.
No matter how well briefed you may be by staff, only the literal "hands on" experience can make for good judgment.
This is not a good sign:
If McCain's got some savvy staffers around him, he needs to undergo a crash course.