It really helps to know the law as far as car seats are concerned. Even if you don’t have any kids, chances are at some point in time, you will want to transport a child in your own car.
Please check my facts, but here is summary of what I have found:
NHTSA suggests using car seats for kids up to 8 years old, 80 pounds, or 4 foot 9 inches. The problem is, I know some adults who are under the height and weight ranges — can you use a car seat in the driver’s seat?
In Florida, children 0-5 must have some sort of extra seat.
Digital Eagle 