As every generation approaches 30, there’s an inevitable thing that happens: people stop talking about that group as if they’re a monolith. The idea that millions of humans who happen to be of a similar age, and also share the same habits and values, starts to break down. Naturally, as people get older, they start to bifurcate. Some get married, some stay single. Some live in cities, some move to the suburbs. Some have children, some…