Haha... I think an age range of 6-9 would be suitable for a keen 5yo. I recall that we subscribed to YES! a year before the suggest age range and we were fine. Worst case scenario, you have to help him read and understand a few things. If they're keen on science, I'd rather err on the side of a little bit challenging than not challenging enough.
If it was a kid who was resistant to science, I'd be more inclined to stick with the easier stuff, so they can focus instead on how fun it is without struggling with understanding it. But it doesn't sound like you have that problem.
If it was a kid who was resistant to science, I'd be more inclined to stick with the easier stuff, so they can focus instead on how fun it is without struggling with understanding it. But it doesn't sound like you have that problem.














