Kids and airbags?

WHEN YOU ARE 8, 9, 10, 11, OR 12 MORE THAN 4’9” (57 INCHES) TALL MAY USE AN ADULT SEATBELT, BUT MUST KEEP YOUR BACK AGAINST THE SEAT BACK, YOUR KNEES BENT OVER THE EDGE OF THE SEAT, AND YOUR FEET FLAT ON THE FLOOR IN THE BACK SEAT OF THE CAR.