Mike, I don't think you really mean age=experience. You mean the older you are the more likely you are to have more experience based on averages. I've met several people at work who are older than me, but immigrated to this country without ever driving. They have 0 experience driving and they are very scary to ride with (from what I've been told heh heh.)
Anyway, I agree that in general it works out that way, but I don't believe the age restrictions should be increased, rather, the requirements should be. I definitely didn't say "no seat time," I said more seat time. I think people ought to log lots of sim hours (especially with the technology available now) and supervised hours as well. Number of hours logged should be much more important than age.
Auto accidents are the #1 cause of death of everyone under the age of 45 as well, not just teenagers.
If I owned the roads my restrictions would be based on performance history and experience, not age. The main problem with our entire country is that the government owns the roads, not me, so there is nothing I can do about it. But that is a totally different topic.
As long as we are talking about roads, though, check this page out:
http://www.americanautobahn.com/