Hello K. H.
I have a daughter 5 and a son who is 9 and this works on both but I had to keep doing it until they knew I was serious. I count to 5 and before I started it they looked at me like I was crazy. I kept with it and now it works everywhere. I can do it all over the place and if they dont listen for some reason than I take away a favorite thing they have and it gets their attention. By the time I get to 3 and they dont listen they know they are going to loose a privelidge. It should work.