16 and you have to get a driving permit (but pass a test first), and (in some states like the one I live in) you have to wait at least 6 months, then get your driving test (driving this time) and pass it to actually get your license. Back in my mom's day, the process was quicker than now (but she still had to pass the tests and legal age was also 16). I wish it wasn't this complicated :(