The Detroit News.
Size is more important than age in determining how long to use a booster seat.
The telephone survey of 11,701 respondents was taken between Dec. 18 to Jan. 28. A similar survey in December by DaimlerChrysler AG 's Fit for a Kid program found 96 percent fo caregivers didn't know the correct age at which a child no longer requires a child safety seat or booster seat.