Why are so many people in their 20s taking so long to grow up?

Even if some traditional milestones are never reached, one thing is clear: Getting to what we would generally call adulthood is happening later than ever. But why? That’s the subject of lively debate among policy makers and academics. To some, what we’re seeing is a transient epiphenomenon, the byproduct of cultural and economic forces. To others, the longer road to adulthood signifies something deep, durable and maybe better-suited to our neurological hard-wiring. What we’re seeing, they insist, is the dawning of a new life stage — a stage that all of us need to adjust to.