Maxi Cosi Rodi Airprotect
does the back come off the base when child gets older?
No it doesn't, but it fits kids up to age 12. Which did a survey recently which showed that children are far safer in a booster seat a back on it anyway as it gives them protection from side impact which they don't get from a booster cushion. They don't recommend booster cushions at all which scared me a bit, hence the reason I bought another high back booster.