5 years & up. This individual aquarium/terrarium is perfect for your classroom or home. The one gallon size makes a terrific terrarium for plants or aquarium for small fish. Best of all, each is made of plastic that is sturdy for all types of use. The molded "feet" on the bottom keep them from harming furniture. Makes an excellent learning tool for children of all ages. Measures 8"L x 4 3/4"W x 1 1/2"D.