New drivers, teenagers cause more accidents than any group, however we do not intend or even suggest that we take away their priveledge to drive.
Sure we do. Well, it depends on the state, but California keeps imposing more and more restrictions on teenage driving in response to the number of traffic fatalities in that age group. These days there are limitations on when kids can drive, how many other kids can be in the car, when they can drive without an adult present ... it's a long way from when I was 16 and suddenly had all the rights and privileges of someone who'd been driving for thirty years.

But laws won't do everything. Even if states restricted licenses for seniors, it might not help, because the same factors that make some people unsafe to drive could also make them unwilling to respect the fact that they no longer were legally permitted to do so. Families have to take responsibility, and that is much easier said than done. Elderly people have been known to actually steal cars. (Not that anyone I'm related to ever did that, ahem.)

I think the answer is probably for people to be aware of this issue when they are younger. Talk about it with your spouse, with your kids, with your doctor, so that you have more objective people around to let you know when it's time to give up the keys. And, from an advocacy standpoint, it is much easier for seniors to stop driving if they have other options ... which means public transportation.