Obtaining a drivers license is much harder and more comprehensive than what is required in the U.S. Also, once you get a drivers license, the Department of Motor Vehicles (Which is run state by state BTW) will pretty allow you to skip tests, either the written test or driving tests for license renewal. I got my license when I was 18 and only had to do a writing test once, and a vision test once. After other time I renewed my license, I either renewed by mail or online.