That's the way to be. I'm almost 40 and I can't see myself suddenly deciding that metal is innapropriate for my age or something. I'll be a metalhead until the day I die. Of course, this isn't to the exclusion of other music. It's just that i'll never stop enjoying, or start being ashamed of listening to metal no matter how old I am.
I'm with ya man... I'll be 43 in March 09' and quite honestly, the older I get the heavier I tend to like it