About a week ago, my wife and I had sold our Ford to someone. This person showed up with another individual who he said, "Knew about cars". After a test drive and a careful look over of the vehicle he decided to make the purchase. My wife had the vehicle looked at by a mechanic to make sure it was o.k. to sell. They looked it over and gave it the green light. After a week, the buyer returned, along with his mother, saying that the Ford was in terrible shape and that, according to their mechanic, had a number of problems and should have never been bought. Apparently the buyer was 16 years of age, which we did not know because he looked to be in his early 20's and arrived in another SUV that he himself was driving. The vehicle was purchased in cash, the title was accepted on the spot, and we made the buyer aware of all that we knew to be wrong with it, which wasn't much. The mother told us that we had no right to sell to a minor even if said minor had a license. Does she have a legal precedent to sue over this? Did we unknowingly do something illegal?