It is age 16 or 17, because I am well aware that ages 18+ are generally more responsible with driving whereas 16 or 17 year olds under peer pressure and inexperience and distractions within the car often lead to car accidents. It is definitely under 20 and it depends on what study and survey-type they used, but it would most likely be between ages 16 and 17. Like this answer? Give it a Brainiest reward if so.