How old do you have to be drive a farm tractor?

It depends on the jurisdiction. In some states, you can drive a farm tractor at any age, as long as you have the permission of the landowner. In other states, you must be at least 14 years old to drive a farm tractor on a public road, and you must be at least 16 years old to drive a farm tractor on a highway. Please check the laws in your jurisdiction.