I agree with Speeder to some extent on this (what?!)
The problem or issue as I see is the age part of the tesing. I've heard people say its just common sense to test at 65, then some say 60, some say 70...so what is it? Gets back to what I've believed all along, it should be done at regular intervals from the day you get your license. If ya take away a 62 year olds license, and they can't get to work because they can't drive, you threaten his/her income and retirement. Now you've got the liberals (hang with me here) crying unfair...we're gonna have to fund his transportation to work, driving is a right, blah blah. On the other side of the camp, the conservative says we need to test yearly, but we don't want to pay for it. So where's the happy or effective ground? IMO, it starts with better education from the get go (getting drivers in this country serious about saftey and driving, and quit blaming the manufactuers while were at it). A bi-annual test and license renewal would probably up the catch rate on both the teenage crack head, and the elderly person loosing their sight/reflexes/whatever.
Maybe not the best answer, but a helpful start. Unfortunately at the end of the day we've got 10 dead, their hopes, dreams, and promise of the future flushed away by an inexcusable accident.
-BG