Around 30 to 35, don't remember which year it was exactly.
And the thing that was largest in making me go, "Yeah, this isn't good for me, I need to quit" was that it was consuming my thoughts all the time. When I wasn't in front of the computer gaming, I was thinking about the game and planning the strategy for my next move. (I usually played turn-based games rather than action games). Which is fine in small doses, but it was taking over my mind when I was at church wanting to focus on worshiping God, when I was at work (and distracting me from getting work done), when I was trying to read...
Basically, I realized that it was an unhealthy focus for me, and taking over way too much of my attention that I wanted to be able to spend on a much wider variety of things. So I quit. First year was the hardest, second and third years were hard too, but by now I've gotten used to reaching for a book to read rather than a game. And the book, I can put down anytime I need to, without feeling that empty-ish feeling that says "Awww, I want to get back into the game..." That letdown when I exited the game was another clue, BTW: it matched how I'd heard drug addicts (specifically, former addicts who had kicked their habit) describe the feeling of coming down off a high. I've never used drugs myself so I can't compare it directly, but it was similar enough to the descriptions I'd heard from them that I said "okay, that's probably not a good sign either."
And the thing that was largest in making me go, "Yeah, this isn't good for me, I need to quit" was that it was consuming my thoughts all the time. When I wasn't in front of the computer gaming, I was thinking about the game and planning the strategy for my next move. (I usually played turn-based games rather than action games). Which is fine in small doses, but it was taking over my mind when I was at church wanting to focus on worshiping God, when I was at work (and distracting me from getting work done), when I was trying to read...
Basically, I realized that it was an unhealthy focus for me, and taking over way too much of my attention that I wanted to be able to spend on a much wider variety of things. So I quit. First year was the hardest, second and third years were hard too, but by now I've gotten used to reaching for a book to read rather than a game. And the book, I can put down anytime I need to, without feeling that empty-ish feeling that says "Awww, I want to get back into the game..." That letdown when I exited the game was another clue, BTW: it matched how I'd heard drug addicts (specifically, former addicts who had kicked their habit) describe the feeling of coming down off a high. I've never used drugs myself so I can't compare it directly, but it was similar enough to the descriptions I'd heard from them that I said "okay, that's probably not a good sign either."