dude, you may be surprised if you are older and kidless
http://www.iihs.org/laws/childrestraint.aspx
you might need a lawyer to read the chart, but if your kid is too small, low weight or too short, in some states, then they might be in a car seat until middle school
If a kid is under 4'9" they need to be in a booster seat so they don't get seriously injured by the seat belt in the event of crash. Booster seat doesn't equal car seat.
