Ask an 11-year-old

Then there’s the really fascinating part. People in their 20s are having a new experience: They are, for the first time, noticing some of the things actual teenagers enjoy and are being completely appalled, both morally and aesthetically. A flood of young rappers is scoring hits with music that baffles grown rap fans with its slurry boneheadedness […] If the last version of pop was driven by people who desperately wanted everyone to care and everything to matter, it’s only natural for the next wave to be interested in what it looks like when you don’t care, and nothing matters.
25 Songs That Tell Us Where the Future of Music is Going, Introduction by Nitsuh Abebe, New York Times Magazine, Sunday, March 11

The introduction concludes with,

"Keep scanning along that birth chart, and it will emerge that the highest number of births in American history seems to have come around 2007. If you want to know where music is going, ask an 11-year-old."