It depends on how tall the child is. Most people would day seven, but in my opinion, it should be based more on size.
The age that a child should use a car seat booster is when they are 2 years of age. Some kids need to use them a little bit earlier because weight and height has an effect on how earlier the kids need to use the booster seat.
The recommended age for children to use a back booster seat is typically between 8 to 12 years old.
A child can safely use a booster seat when they have outgrown their forward-facing car seat, typically around the age of 4 to 8 years old and at least 40 pounds.
If you are still the age that you have to sit in a car seat then you can but you have to be taller than the airbag
When transitioning a child from a car seat to a booster seat at age 5, it is recommended to follow these safety guidelines: ensure the child meets the height and weight requirements for a booster seat, use a high-back booster seat for added protection, properly secure the seat belt across the child's shoulder and lap, and make sure the booster seat is installed securely in the vehicle.
The recommended age for children to use a booster seat with a back for optimal safety in vehicles is typically between 4 to 8 years old.
A child that is age 8 or younger and weighs no more than 80 pounds can use a booster seat in New Jersey. Children over the age 8 must use a seat belt.
In Arkansas, children must be at least 6 years old and weigh at least 60 pounds to use a booster seat.
A child should use a booster seat until they are at least 4 feet 9 inches tall and between 8 to 12 years old.
It's reconended that you use a booster seat up until the age of 5 ears old, or until you're tall enough, but technocally, it is for your parents to decide.
The recommended age for transitioning a child from a car seat to a booster seat is around 8 to 12 years old, or when they reach the height and weight requirements specified by the booster seat manufacturer and local laws.
the weight to sit in a booster seat is...40 pounds AND the age of 4 years, BUT preferably the child is longer.