Shortly before the baby arrived I put my oldest (just shy of six) in the booster variation of her Frontier. I thought it would make my life easier to have her in the "way back" of the minivan and figured she could handle the responsibility. She was in this seat for right around five months now...and it felt like every single time I caught her glimpse in the rear view mirror she was slouched down, leaning over to talk to the baby, putting her feet up on the shoulder of the seat in front of her, etc. After a few million reminders to sit up and WHY she needed to sit safely and a few sharp pulls off the road (thinking maybe stopping suddenly to remind her that the car can't move when the kids aren't safe) I finally made the executive decision to re-harness the seat. Since she's now six it's not an issue for her to fully harness herself and pull it tightly.
Clearly she's not ready for long-term boostering...
Which got me to wondering when most kids are truly ready. Now, my daughter is a mover and a shaker. She can sit still for just a few minutes before she's wiggling and moving. She's the kid that does cartwheels down the street instead of just walking to the bus stop!
At what age were your kids able to sit safely in the booster? Did you give them options to be boostered and then opted they weren't ready yet?
Luckily my kids know that I'm nuts and don't see it as unusual to still be in car seats RFing until eternity. I'm still amazed at how many of my oldests' friends (mostly old 5s, young 6s) are in nothing more than belt-positioning boosters.