I'm 19 (so i'm in the range) and I heard it clearly. It wasn't the worst thing ever for 8 seconds but i suppose after a minute you'd want to kill something. I know people who will beat some one for scratching a fork on a plate for a few seconds and I imagine this will send them in to a frenzy. I have two very critical yet tolerant ears. I love my music and movies sounding perfect and I can get irrated by some poor speakers or retarded EQing, but at the same time a sound like that isn't gonna piss me off to no end.

I think my dogs wn't appreciate it but i dubt my dad will hear it. I hope my ears don't get to a point that they can't hear frequencies like that. But it'll happen slowly so maybe i won't notice.

BTW, a TV on in a quiet room with no sound coming from it is unpleasent to me. People always ask my why I turn off TV's that aren't even playing anything and when I tell them they look act like 'm pretending to hear a noise.