Final answer:
To hold a commercial driver's license, the minimum age requirement varies depending on the class of the license. Class 3 licenses require a minimum age of 18 years, while classes 1, 2, and 4 licenses require a minimum age of 19 years.
Step-by-step explanation:
The age requirement to hold a commercial driver's license (CDL) varies depending on the specific class of the license. For Class 3 licenses, which are for vehicles with a gross vehicle weight rating (GVWR) over 14,000 pounds, the minimum age is 18 years old. However, for classes 1, 2, and 4 licenses, which are for vehicles with a GVWR over 26,000 pounds or vehicles that transport hazardous materials, the minimum age is 19 years old.