Honestly, I find the lines themselves distracting enough.... and I'm 21. I still get lost looking for the hidden mickeys or looking at "all the pretty colors". I'm a little upset when I walk through WDW and all I see is people on their phones while they are in line. I love watching the people walking around gnawing on their turkey leg, or kids with there BBB hairstyles, or again just the lines themselves. Put the apps on your phone just in case, but I think they will be able to occupy themselves just fine at that age!