DD had to pass the 5-pt test... which means, at 12yo, 58", and 80lbs, she just sat outboard in our SUV for the first time this month. She fit our old sedan outboard at 10 or so. We're pretty "serious" with the booster, even taking it on vacation, since we just didn't know how she would fit. The new car we got (Honda Accord) doesn't fit her as well... but she's in the middle of a growth spurt, so I imagine she will fit better very soon. The shoulder belt just hits a smidgen high.
She's begging to sit in the front seat, and knows it's (generally) not allowed until she's 14.
--Mimi
Mom to Lala (2004), Bonus Mom to Big Sis 1 (1991) and Big Sis 2 (1992)
Grammy to Big Kindy Kid (2011), Big Pre-K Kid (2012),
Grandbaby Appendage (2014), and New Baby Grandboy (summer 2017)