As I said, it's all moderation. My daughter is almost 3 years old. She asks to play video games, yes... but she also asks to read books. She can count to 20, recite her ABCs, point out words she knows (the first time she read Game Over as actually just a couple days ago which is funny since that was likely one of the first words I read as well. I learned to read by playing and watching other people play Dragon Warrior (quest) 1), etc. We take time to teach her real world things, we go out to the store and I help her count out my change, we spend a lot of time with our family since they all live close.
On a gaming forum especially it's concerning that there are some people that truly view gaming as such a bad habit... something I should be shielding my daughter from, hiding her from it as long as possible. That's silly. The way to teach a child about ANYTHING is not to avoid it, but to let them experience it and to explain to them (yes, even at such a young age she may not understand it at first). Occasionally that means telling them "Okay, that's enough games for now" or "If you don't do what I say, no more games tonight." but it's hardly any different from saying "No more cookies tonight" or "No soda before bed time".
.
