Age is just a label, and a meaningless judgement tool of the person. When it comes to music though, I don't know too many "older" people (well, actually none) who listen to the music I do. Opeth is my favorite band, and I like my music loud and heavy (Grip Inc, Meshuggah, Nevermore, Vomitory, etc etc). People think I'm "cool" because I listen to metal. Yet I look at most of the people my age and think I'm the normal one (not cool, just up to date) and they're all stuck in some long gone past era. People should keep up with the world around them, and that includes music.
I'm 45, and I'm taking my 20 year old daughter to the Worcester, MA show on Oct. 30th. My 22 year old son can't make it, but he's already seen Opeth with me (his favorite show I've taken him to was Slayer).