This says 9 months to 4 years on the box, but we bought it as a play nest for our very wriggly 6 month old.
Worked well as a play nest which he could sit at at 6 months - he was a wobbly sitter at that stage. Now he's 7 months he can wriggle out of it onto the floor by the side. That said he then tries to climb back in so I think he's happy clambering.
The car is well made and I can see him using it until he's a toddler.
The detachable dashboard is really sweet, making car engine sounds, swivelling clicking steering wheel, and a radio button. So I think when he's older he'll still be playing with this.
I was planning to use this for travelling, but even deflated its still quite big, so whilst I have taken it on a trip abroad, I probably wouldn't again.
All in all a good buy for babies and toddlers, although I'm not sure a 4 year old would use it (which is the age it says on the box).