Driver's license
The minimum driving age varies between 16 and 18 years of age in different States and Territories. After the minimum age, a graduated licensing scheme operates, with state variations.
Car rental
For insurance reasons, some companies stipulate a minimum and/or maximum rental age. In some cases, the minimum age for rental can be as high as 25, even in countries where the minimum legal age to hold a driver's license is much lower, e.g. 14,15,16 or 17 in the United States. It is not uncommon for there to be a young driver surcharge for all drivers aged under 25.