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It's not aimed at any particular age, I'd say its amazingly flexible. Kid rode for at least 5 or 6 years before I couldn't really support his weight from the front bike easily.
Good for taking a smaller kid longer distance. We camped with it a couple of trips.
Also I rode with my lad on busy roads to get used to that.
We rode to things, where a completely knackered kid wouldn't have been much use.
I can't really justify it. The big kid rides a bike of her own quite happily and the little one sirs in the seat on the back of mine.
I don't really understand what age this is aimed at. Did your son use it at an age when he could also ride his own bike, for longer rides or something?