How'd I get into metal? Only very recently. Though I'm an "old fart", I only seriously got in to metal about three years ago.
SkiBumMSP (Steve) did it. He found it by discovering Stratovarius on Music Choice on DirecTV (they have since switched to XM radio). He then found out the world of power and progressive metal.
He was telling me of all these bands he was listening to, and about how Strato was going to play at ProgPower USA VI in 2005. He invited me to go with him. So I started to listen to the bands that were playing that year - and it grew from there. Had a blast at the last three ProgPower USA shows and already have the tickets to the upcoming one.
Lots of metal out there to listen to. Still playing catch up!

