from a littly to juvenile our cat loves this
bought this for our kitten when she was only 7 weeks old and she loved it spent hours amusing herself chasing the ball & also used to curl up in the middle of it- now 8 months later she still loves it, even though shes getting a bit big to fit curled up in the middle when its in a circle shape.i leave it in a ring shape for a few weeks and then change it back to a a wavy track and she still spends ages playing with it