When you are traveling in the USA and planning to rent a car, you should take into account that different states have different rules. How old do you have to be to rent a car in the US?
Basically, the US age policy stipulates that the minimum age of a driver to rent a car is 21 years. Enterprise, Advantage, Sixt, Avis, Europcar, Budget, National and many other providers are authorized to rent cars for users aged 21 to 24 and even younger. I advise you to visit the website and see where you can rent a car depending on your age.