Yeah, these guidelines/laws are crazy! 7 years old! I think I was out of my child seat at 3-4.
My 2 1/2 year old is closing in on 4' quickly.... I can't imagine keeping him in one until 7.
If he is my height (which it looks like he'll be taller) at 13 he could be over 6' tall.... and crammed in the back seat