I don't disagree with you about "older" drivers being more of a problem than middle-aged ones. But it's not because they (as a group) are immature, whereas with the younger ones, it's exactly that. That and a lack of experience. At some point in time, the terms "children" and "adult" were created. Maturity on the other hand can be exhibited by almost anyone, of almost any age. However, maturity without experience is primarily exhibited by people who are younger, rather than older people. It's a function of time, I believe. And it really doesn't have to work both ways, in fact, to a degree, it can't. Thankfully. Because if it did work both ways, how would you feel if your wife and two children got on a commercial flight, flown by a 16 year old pilot?