In most states, you have to be at least 21 years of age before you can get your commercial driver’s license, but some states allow drivers as young as 18 to get this license. If you are younger than 21, however, you will only be able to apply for a single-state CDL that allows you to drive these vehicles in the state where you got the license but not across state borders. You will also need to prove that you don’t have any prior criminal offenses that disqualify you from getting a CDL. Only certain criminal offenses will disqualify you. Beyond age and criminal record, each state has its own requirements that you need to meet before you can take the CDL test. In addition to applying for your CDL, you also need to apply for specific endorsements depending on which type of vehicle you plan to drive. For example, if you plan to drive busses, you will need a Passenger (P) endorsement. If you will be transporting hazardous materials, you will need a Hazardous Materials (H) endorsement.