At least more than 350,
began at Commander Keen games then Duke Nukem'and after that i grew up to RPG's and
later i got an SNES, after that i got addicted to Red Alert 1.
Playes about on my uncle's computer there i played Red Alert 2, Commando's.
After that i went to my father's work as they held LAN parties all the time and played NFS and Quake.
After that i played Tomb raider on my dad's PC, then SWAT games and Flight simulator,
I got my first not DOS pc game when i was six years old (Rayman gold).
Now i still spend all day playing video games.
In the end i came back to Half-Life 2 on my uncle's X-Box wich he later upgraded to an 360,
but i was a self sufficient gamer when he did, now i'm playing Gmod and CS all day and finish random other games and my GF got me into the Devil May Cry series.
I'm not going to drone on for too long, feel free to ask for specifics!