i started using bitcoin in 2014 about a year ago. it is around the same date i registered here.
but i have heard about bitcoin much longer before that. maybe around 2-3 years, around the time when everybody was doing solo mining and bitcoin price was skyrocketing through the roof.
the reason that i started using bitcoin was mostly because i liked the technology and idea behind it and also i find trading a great way to earn some extra money.