Outgrowing...

Is it possible to outgrow friends, even when you are both already adults? Throughout the past year or so I feel that I have matured a bit (or so I say, right?). I am trying my best to be a grown up, to handle my responsibilities and make better decisions. In doing so, my life has changed quite a bit. Meanwhile The two guys who I was closer to in the past few years, its almost as if they have taken steps back. The main culprit would be the mental fountain of youth we all call video games. My buddies have fallen captive to video game addiction at startling levels. On new years I ended up finding out that one of my buddies (age 26) has steeped up his gaming time to 49 hours a week, and to be honest, I think he was lying, I think he was minimizing because I was the first person who had ever asked him that. My other two buddies aren’t falling behind either. My simple problem, I’m not into video games anymore! I am trying hard not to waste my time and make every minute count. I have different things to worry about. The result is times while we are sitting in a car and I will have absolutely nothing to say to them (think awkward silence and multiply it by all 30 minutes of a car trip. We officially don’t share anything in common anymore. We don’t relate to each other on any level. I feel bad saying that I have outgrown them but that seems to be the only truth.
What do you guys think? Is it rude/wrong to outgrow people? And if you do, should you tell them or just avoid them?