Can a 9 year old sit in a passenger seat?

Yes, a 9-year-old can sit in the passenger seat, but it's important to follow local laws and safety guidelines. Many places require children under a certain age or height to be in a booster seat or use a seat belt properly. Always ensure the child is buckled in correctly and that the vehicle's airbags are not a safety hazard. Checking specific regulations in your area is recommended.