I knew about bitcoin years ago, if I’m not mistaken, it would have been more than 7 years ago but I really wasn’t serious about it till it blew up in my face as one of the biggest investment one could ever make online.
It was actually 2 years ago that I was able to invest in bitcoin after much delay because the coin became awfully expensive to buy. I’m yet to mine one single btc because of electricity consumption issues and bills.