Its a privilege. I shudder when I think of a day 20 years from now when millions of baby boomers become awful drivers when they hit their seventies, making driving in this country a nightmare.
You would like my law then. I would make it manditory for all drivers (no matter what their age) to retake their written and driving tests before renewing their drivers license. Those that do not pass those two cannot receive their license. Most of your old drivers would then lose their privilege to drive, and some of these college kids would too. 
Nobody would like that law - it would require spending time in the DMV.
To answer Lewis, four years, at least in my state.
Wow. Retesting every four years sounds excessive (not to mention expensive) to me. Although I'd approve of it for the elderly, say over 75.
My grandfather, who's 80 years old, showing slight signs of dementia, and lives in Greece, isn't driving anymore. This is because he was told by his neighbors that you, in Greece, need to take a test again every five years after you turn 80.
The reason they told him that lie is because they wanted to stop him from driving while intoxicated.
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