Each car rental company we represent charges an "underage" or "young driver" fee. The rate varies with each company from between $10/day and $30/day. While you may be an excellent driver, statistically, this age group is involved in a much higher incident rate. Most companies will not rent you a car if you are under 20. Dollar and Thrifty will rent to age 20 drivers. For more information on the underage driver surcharge fees, please visit our Hawaii Age 20-24 Underage Driver Fees page.