Normally, sixteen. You must complete either driver's education through a driving school, or through the parent-taught lesson plan, and pass a written test (this can all be done at the age of 15). Then you will have a permit for six months before you receive your license. This allows you to drive ONLY with someone over the age of 21 present. You will only be given a license after (a) six months of having your permit AND (b) you must be 16. There are restrictions on your license for the first six months (I believe it's 'no passengers under 21' or 'only one passenger under 21'... something like that.).
OR you can wait until you are 18, take the written test, take a driving test, and if you pass, obtain a license without taking any kind of course.
OR in certain situations you may be able to obtain a license at the age of 15. This is called a "hardship license". However, to obtain this type of license you must be able to prove a hardship such as having a job that helps pay bills for the family, not having a way to school (NO BUS ROUTE & NOT WALKING DISTANCE), or in some cases, being the eldest in a single-parent family with younger siblings will do. However, you still have to complete a driver's education course and have a permit for six months before you will be granted a hardship license, so starting the process when you are fourteen is recommended.
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