In California you can get your permit at 15, then you need 6 hours of behind the wheel classes with someone from drivers ed. You also need like 30-50 hours during the day, and 10 hours of driving at night. Then you can get your lisence at 16.. but there are still more rules you need to follow.
During the first six months you are licensed to drive you must be accompanied by a driver 25 years of age or older if you drive between the hours of 12 midnight and 5 a.m. or if you have passengers under the age of 20 in the car at any time.
During the second six months, you must still be accompanied by a driver 25 years of age or older if you drive between the hours of 12 midnight and 5 a.m. You may have passengers under the age of 20 in the car without supervision between the hours of 5 a.m. and midnight.