I've been wearing my seat belt since I started driving. In fact, I was the first one in the family to do so. Before seat belts became law, I had friend who, for some reason, decided to buckle up on the way somewhere. Within minutes of buckling up, she had a serious car accident. She said if she wasn't wearing her seat belt, she probably would have gone through the windshield. That was enough motivation for me to start wearing mine.
Years ago, I knew a woman who refused to wear a seat belt. She said a relative of hers had a car accident, was thrown from the vehicle, and survived. The police officer on the scene said to the relative that if they were wearing their seat belt, they would have been killed. Being thrown from the vehicle saved their life. Of course, this accident occurred before airbags and other safety devices were on vehicles, so hopefully this woman has come to her senses and is now wearing her seat belt.