how old do you have to be to seat in the front
1 Use a booster seat in the back seat until your child is big enough to use the car's seat belt.. 2  8 years old or 4 ft 9 inches tall â12 years old. 3  Have your child sit in the backseat with a seatbelt. 4  At 13 years old, your child can sit in the front seat of your car. â 8 years old or 4 ft 9 inches tall. 2  Use a booster seat in the back seat until your child is big enough to use the car's seat belt.. 3  8 years old or 4 ft 9 inches tall â12 years old. 4  Have your child sit in the backseat with a seatbelt. 5  At 13 years old, your child can sit in the front seat of your car.