Mostly because they're kids. I'm sure in a few years they'll be rocking the house with a giant mecha sound system.
What does age have to do with me wanting to throw enough loudspeakers together into a vaguely humanoid shape to level an entire city block through the power of stereoscopic sound? I can mix a mean beat and drop the bass whether I'm six or sixty so give the keys to the mech to me now or I'll splatter you all over the wall!