I love this comment -- you summed up how I feel about some of my younger friends and acquaintances. I'm sure I'll say the same thing about them when I'm nearing 40 and they are entering their 30s -- there will be something new that they are doing that I did too, but didn't realize until later. Life is interesting, isn't it?
As for Hot Topic gobbling up ThinkGeek -- ThinkGeek has become very much a hipster thing IMO anyway, I'm kind of past my phase for it. Most of what they offer now is branded/themed stuff rather than actually cool or interesting stuff. Gone are the days of buckyballs, here are the days of USB Lightsabres.