I was 16, and after playing HL through at least 5 times, I decided to give Team Fortress Classic a try, seeing as how it came with it. It was fun over dial-up, but the deathmatch-esque style did not sit well with me. I was vindicated years later by, on a whim really, to d/l Counter-Strike 1.5. That changed me. I played it all the time, played through 1.6, and I am still playing CS:Condition Zero to this day. Mostly because I found a great server, great people to play with (Which is VERY rare), and I don't plan on stopping.