I bought this subscription for my 8 year old son, which is a tricky age but it is a perfect fit. He loved every item (the mosasaur tooth, especially) and he's treating the included fact cards with a reverence normally reserved for Pokemon cards.
I love that these have the perfect feel of treasure that little boys love. If we lived near one, I'm sure his pockets would have baobob seeds in them, but seeing them in our box is a pretty good second.
The box is quite educational, and I think every item will grow with him and add to his collection of curiosities. Really glad I made the purchase.