16 in GA, same age as when you can get a car license. They don't feel you're ready to operate any motor vehicle alone until you turn 16.
Wisconson is also 16.
The WI info was found at:
http://www.dot.wisconsin.gov/drivers/drivers/apply/permit.htm
in less than 30 seconds. Try doing a little research for yourself next time. I realize that with the advent of the internet forums, it is easier to ask a question and let others do the work, but it's either laziness, or you're too stupid to look up anything for yourself. How can you expect to ever succeed at life if you can't be independent enough to call your local licensing bureau (whatever name it goes by)?