I think every 3 years you should have to retake the test. I also think that past traffic convictions should count against you when you're taking the test, so you need extra points on the to renew your license than someone who's scot-free.

There are a lot of middle-aged maniacs out there. I'd rather share the road with someone who went 30 MPH under the limit than someone who went 30 MPH over.