I'm 56.
My sons (23 and 29) got me into it- they built a custom GPU rig for BTC mining about 2 years ago. I started reading up on it, and when it came time to build a new PC for my home office, I got a nice case that can hold the longer GPU cards. I now run 2 cards in it (5830 and 5750). With the BTC difficulty increase, I have since switched them to LTC.
Back in Feb 2013 I ordered a BFL 30 Gh Little Single, and just got it a week or so ago. It was defective. It came with only 2 screws holding the motherboard, and a rattling loose Mobo screw. Even after adding the screw, the PC couldn't see it, and the fan wouldn't turn. So still didn't run.

. After an RMA, got a working one a quick week later and have been ASIC mining BTC's since.