I think that is dependant on the particular State, e.g. can't Californians drive at fourteen or something ridiculous?
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I can't drink until I'm 21 by California law.
In California, with parental consent, you can get your driver's permit at 15 1/2 years of age, and your driver's liscense at 16, or after six months/200 hours of practice any time before you turn eighteen. Unfortunately, you're also your parent's b!tch in California until you turn eighteen (I couldn't even get a library card without a signed waiver), and since my father deemed me 'too irresponsible to drive' I've got another week before I even get to start learning.
What really bites, is he decided my little sister was responsible enough to drive, so she's already been driving me around for a couple of months.
I hate my family.