Get it here. The most complete account of the early-'90s Seattle music scene. Pre-order your copy of the updated second edition. This generation-gapping has since become officially recognized by Beloit College in Wisconsin. For at least the second year, Beloit has released a list of cultural reference points that differentiate students born in the early '80s from their presumably-older instructors.
Diversity already exists, darn near everywhere.
If we're really lucky, such lists might also dispel certain boomer-centric myths. They've had Beatles nostalgia shoved at them all their lives, but have never heard of Wings. Some more of this, including some of your suggestions about what youngster things oldsters don't get and vice versa. Brief looks at a few real-estate relics. Newspapers try to stem circulation declines by becoming even duller.