Age: 25
I hate to admit it, but I started learning Japanese 10 years ago in high school. Japanese classes were never really my strong suit, so I continually did poorly. When I entered college I started doing terribly. I lived in a Japanese dormitory for a year when I promptly got a D+ in Japanese, which led me to start studying on my own (ie. I was not allowed to continue, so I stopped for 2 years). I found this site and subsequently RTK (followed shortly by an introduction to Anki) in my senior year of college around the same time that I applied and got accepted to grad school in Tokyo. I finally finished RTK in the summer of 2009 (I think ... I don't remember, I could always look at when I posted in that finished thread ... but, meh). I still never had a good continuous study/reading regime until about last Summer, though (This oddly coincides with the release of Ankimobile and my buying of an iPhone ... well whodathunkit). Took me long enough 
I gotta say, if I had never found this site and all the resources and discussions around here, my Japanese would still be pretty pitiful despite having lived here for 2.5 years already. In fact, Kanji was far and away the worst part of my Japanese (followed by vocab) until I finished RTK. Thanks to all of you guys on this forum!