The situation for young drivers isn't as restrictive as it was even a few years ago when most major car rental companies didn't allow anyone under 25 to rent. These days drivers age 21 to 24 are permitted to rent at most locations operated by Alamo, Avis, Budget, Dollar, Enterprise, Europcar, Hertz, National, Sixt and Thrifty subject to additional fees, requirements and restrictions.
In most cases these drivers are required to pay a daily surcharge that can vary by company and location. Additionally, restrictions generally apply to the categories of cars that young drivers are permitted to rent. Typically high passenger vehicles and luxury cars are off limits, however, some companies and locations will allow these vehicles to be rented for an additional fee.
Drivers ages 18 to 21 are generally unable to rent from most companies and locations. In the United States, New York and Michigan state laws require agencies to rent to drivers ages 18 and older. However, hefty fees and restrictions apply. There are other countries and companies that allow younger drivers but again there are usually additional costs and restrictions involved.