Graco Backless TurboBooster Car Seat in Baker Any child is sure to feel great riding around in the backless TurboBooster youth booster seat. This backless version has padded, height-adjustable arm rests and hide-away cup holders on either side of the seat - perfect for storing drinks, snacks, and toys for those long rides. The backless TurboBooster youth booster seat is for children from 4 to 10 years old, from 40 pounds to 100 pounds and between 40 and 57" tall.