There's no "rule" for what's appropriate for your child. All kids are different, and you know yours better than anyone. That said, WompleBox is designed especially for, and kid-tested by, children ages 6 to 11. For kids on the younger side, we encourage parents to read the books and do the projects & activities with their kids. For kids on the older side, we've written the materials and designed the projects to be fun and engaging without the need for parental supervision.