In 2002/2003, I saw my cousin playing RSC, but I was too young to understand the game back then so I wasn't really interested.
I started my first account in 2004, but I didn't play regularly until around 2005. In 2007, I quit when the updates to RWT were introduced, in summer 2008 I started playing again, only to quit at the end of the year. In 2009, I started playing around February, and carried on playing for the rest of the year. In 2010, I played regularly until March and then went on a long break for 4 months. And then recently, I am playing because of the holidays, however during school days I don't plan to play as much because of commitments.
So in a nutshell, I have been playing Runescape since 2004.