How old do you have to be to test-drive a car?

Answer:

First you must be a serious buyer. They don't waste their time with joy rides. Second you need to be 18 or over, the age at which you can legally enter into a contract, or have someone 18 or over accompany you who would be a co-signer of the contract if you did purchase a car.

That is how the sales person earns a living, and they don't appreciate people who waste their time and keep them from a customer that will buy a car.