I've had the following experience several times over the past year. I'll be in a restaurant or coffee house, and a classic rock tune will start wafting over the sound system. As I think to myself, not many under 30, possibly 35, will like or even know this tune, I notice that some of those in the Millennial Generation around me not only do like and know the tune, they're flat-out jamming. Some of the more notable incidents have involved David Bowie, and just last week I watched and listened as two twenty-somethings blasted from their iPod "Stairway to Heaven" and other Led Zeppelin nuggets. One of these guys seemed to know every riff and lyric.
Big surprise, big relief. My youth is not entirely gone.