Well my son's only 2 years old.
The issue I have with the effing thing is that you touch anything, even put it too close to a mains cable and that sets the damn thing off.
This is how blood stupid the thing is, if you pres the off switch when the thing is switched off, it turns on, plays the on ditty then the off ditty and then switches off!
Like I said, I have a very durable patient when it comes to some things, others I spontaniously explode.
This thing is pushing its luck.