My little one had the bounce a roo until he was a little over two. It is like the Johnny jump up, but free standing and adjustable to their height. We have 3 boys 8, 6, and 3. We have a commercial size bounce castle (purchased to rent out), and just got a trampoline for Christmas they are both a huge hit! I would wait on the full size trampoline until after age 6, but the bounce houses are a great place to start. In the bounce houses, you are unable to send someone soaring, you don't get as much height, and they are more geared for simply bouncing not sport. We keep our Castle rolled up and in the garage. The smaller ones found at toy stores and wal mart can usually be stored in a large container (find one with wheels). Hope this helps.