You really want to make your choice based on the weight and height of your child rather than the specific age. The key feature to keep in mind when you're putting your child into a booster seat is to make sure that the seat belt that you use in the car will still work properly and will fit the child in the proper position if it goes across the shoulder. You should always check the installation and safety guidelines that come with any new car seat, and make sure it is appropriate for your child.
When Should Child Move to Booster Seat?
Pediatrics Expert Advice from Shari Nethersole, M.D.