There’s something biological going here I would think. 30 is about the age where fluid intelligence peaks but crystallized intelligence continues to grow for a few more decades. Also, 30 is about the age where a lot of us come into our own as the person we will more or less be for the rest of our lives. I know for myself that in my teens and twenties, music was part of the process of defining myself. By my early thirties, I had grown out of that phase and mine or someone else’s taste in music was irrelevant to how we viewed each other. Interestingly, like many men, I have not touched a video game since the age of thirty even though I’ve had the time.