Alamo requires renters to be a minimum age of 21 years for a vehicle rental. Renters between ages 21 and 24 must incur a youth surcharge. This charge averages approximately $25 per day, but it may be modified based on the rental location. Renters aged 21 to 24 are permitted to rent the following vehicle classes: economy through full-size cars, minivans, cargo vans, pickup trucks, and SUV classes including compact, small, and standard.