As a guiding rule, LEGO DUPLO sets are suitable for children between ages 1½ and 4. We know, a lot happens over the course of those years, and each child develops skills and interests at their own pace. If you look for the age markings on a product, it can help you find a set that is sure to give your little one a good play experience. And just because the age markings stop at 4, anyone is still welcome to play and build with DUPLO for as long as they want!