Heh, pretty much the only Metal thing about me is my taste in music
First off, being female and in my mid-thirties puts me outside the stereotypical demographic right off the bat.
Next, I need to dress at least somewhat professionally on weekdays (and besides, as much as I like the Metal aesthetic, I also like bright colors too much to dress that way all the time myself). I'll sometimes wear bluejeans and a concert T-shirt on weekends, but other than that, you'd be unlikely to take me for a metalhead unless I was on the way to a concert or we were talking about music.
(Or possibly when I'm walking down the street with my headphones on. I'll often get into it and start mouthing lyrics and/or bobbing my head a little bit. Not full-on headbanging, but apparently enough to give me away-- one time I met this old guy walking in the other direction (he was wearing bermuda shorts, a hawaiian shirt, and a straw hat) He looked at me kinda funny for a couple of seconds, then got a big grin on his face and threw me the horns. Great moment, actually
)
I listen almost exclusively to Metal, by boyfriend listens almost exclusively to chamber music. This makes long car trips interesting.
I've noticed most metalheads my age listen to stuff that was around when we were teenagers. But while I enjoy the classics (esp. Candlemass and Sabbath), most of what I listen to these days is from this millenium. Go figure.