key paragraph:

With life spans stretching into the ninth decade, is it better for young people to experiment in their 20s before making choices they’ll have to live with for more than half a century? Or is adulthood now so malleable, with marriage and employment options constantly being reassessed, that young people would be better off just getting started on something, or else they’ll never catch up, consigned to remain always a few steps behind the early bloomers? Is emerging adulthood a rich and varied period for self-discovery, as Arnett says it is? Or is it just another term for self-indulgence?