I can't really decide which one I like best/the least. They all have their ups and downs. I like the young ones because they are easy to take care of. The 18 months + are fun because you can start to do more crafts etc... with them. 3 years + is great because they have such imaginations and come out with hilarious stuff, but the attitude begins... I haven't take school aged kids and probably wont due to all the problems mentioned on here.