Much has been made of the wave of millennials moving to cities. In intriguingnew work, geographer and urban planner Markus Moos of the University of Waterloo gives the phenomenon a name: “youthification.” Moos defines youthfication as the “influx of young adults into higher density” cities and neighborhoods. And in some ways these neighborhoods are “forever young,” where new cohorts of young people continue to move in as families and children cycle out in search of more space.

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