Last year, Senator Bass introduced a bill that mandated that all children 12 and under be in a booster or car seat while in a car. The bill also required that all children 2 and under, regardless of weight and height, to be in a rear facing carseat.
His bill passed but not before it was amended to lower the maximum age to 8 and allowed kids under 2 to move to a forward facing seat if they meat the height or weight requirements to switch. That amended law went into effect November 1, 2015.
Apparently Senator Bass is really annoyed that his original bill did not pass. So he has reintroduced it this year nearly exactly the same. He has kept the mandatory rear facing requirement for children 2 and under, but he has changed the maximum age to 13 instead of 12. That means your 13 year old would have to be in a booster seat if they are not taller than 4 foot 9 inches.http://webserver1.lsb.state.ok.us/cf_pdf/2015-16%20int/SB/SB1406%20int.pdf
On a more positive note, Senator Newberry has introduced a bill to repeal the law that went into effect in November, and change it back to the way it was prior to that.http://webserver1.lsb.state.ok.us/cf_pdf/2015-16%20int/SB/SB1417%20int.pdf