But the "getting old" part definitely plays a role too. When you're a kid or in your teens everything is just more exciting and impressive to you. A teen today might think the latest Wolfenstein installment is the most awesome thing they've ever seen while to you it's just another first person shooter or doom clone, with somewhat better graphics. Now you could say "but doom was new and groundbreaking", but even if there had been a dozen identical games before, if doom were the first one you played, it wouldn't have mattered. Graphics is another thing I stopped caring about. In the late 90s and early 2000s I was blown away by new graphics demos released every year showing off what the next gen of gfx cards were capable of. Nowadays I'm so out of the loop. Graphics from 5 years ago look no different than today. Although I must admit the latest unreal engine tech demos actually did manage to impress me.