Growing up in South Dakota I had a farm permit at twelve, (two week course) learners dusk to dawn at 14, and regular permit at 16, Was driving tractors and farm trucks before that, and could handle a semi fairly well some where in there. it was'nt a luxury it was a needed part of life. "(must not have had child labor laws when I was a kid)"
it is something that not only gives a person responsibility young but helps them learn under controlled supervision.
Where I now live the kids get to drive at 17 and a bit, depending on how they fit into the process and are soon 18 with little experiance, and no supervision. not a good formula. just about every parent I know is worried about thier child (young adult),
but to delay the learning process only puts inexperienced young adults in control of not only themselves but cars. And in less 18 year olds are differant in your state, I know of few 18 year olds. that will back down when you tell them they can't, when they want to..... but a 15 year old knows they have three years to listen to our lectures.......