I've had a friend for a while now, 5 years to be precise, and we used to be able to talk for hours with each other. Getting specific, both of us at one point were huge video game fanatics. We would talk for hours on a specific game that both of us played.
Now that we've both gotten older, I've moved on, and I'm not really interested in gaming anymore. As for him, that is the only piece of conversation he has to offer. Most interactions between us consist of one of us talking about what's 'going on' for us (for me, physics and science, for him, gaming) and trying to steer the conversation over to our own subjects. Occassionally, the conversation will just cease after a few sentences.
I have no idea what to do, he continues to start conversations that I'm not interested in. What should I do other than confront him and tell him to stop talking?