How old do you have to be untel you don't have to sit in a car set?

In the United States, the age at which a child can stop using a car seat varies by state, but most states require children to remain in a car seat until they are at least 4 to 8 years old. Additionally, children typically need to be at least 40 pounds and able to use a seat belt properly before transitioning to a booster seat or seat belt alone. It’s essential to follow local laws and safety guidelines for child passenger safety. Always check your state's specific regulations for the most accurate information.