If you're 21 years old, through Miles Car Rental you can access the benefit of renting a Car with Avis and Budget without paying any extra fees. However, with other car rental agencies such as: Sixt, Thrifty, Hertz, Dollar, among others, drivers between 21 and 24 years old will be charged an extra fee.Please note that no additional age-related fees will be charged after the age of 25. For more information, we invite you to check our Frequently Asked Questions section.