Think about how we label music genres based on age groups. The same goes for the medium through which we choose to tell stories: books, cinema, television, video games and even virtual reality. We stratify and categorize our modes of interaction (Facebook is for Generation X, Instagram is for millennials), even if reality is already more fluid. It is not uncommon to see a crowd, for example at Glastonbury, where generations blur to the rhythm of Coldplay’s music. But we’re not yet at a point where you could plausibly ask your grandparents if they know what Brat Summer is and expect them to know what you’re talking about. I imagine that, in a post-aging world, your grandparents will have no problem knowing all about Charli XCX. And what’s more, dancing to his songs with you.