I'm on the younger side of the posting spectrum here I think (late 20's), and I listen to lots of "loud" music that people 30+ probably have not heard of and would hate.
That being said, I also love Zeppelin, Sabbath, Rush, The Who, and lots of bands from my parents time. I also loves tons of 80's stuff.
If anyone is into really raw, fast, loud stuff check out Black Flag and Poison Idea.
If you like avant garde, droney, guitar stuff check out Hum, Sonic Youth, My Bloody Valentine, and Slowdive