CDL applicants must be at least: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question CDL applicants must be at least: Answers 18 years old. 21 years old. 25 years old. Explanation In Idaho, you must be at least 18 years old to obtain a CDL. You must be at least 21 years old to be licensed to drive across state lines.
