'I pictured myself a wine-dark streak in a TV desert, ears too full of the summer wind to hear that ominous ticking in the sky: the sound of a cultural clock counting me out of youth.' Briohny Doyle turned 30 without a clear idea of what her adult life should look like. The world she lived in, with its global economic uncertainty, political conservatism and precarious employment conditions, didn't match the one her parents grew up in. Every day she read editorials about how her millennial cohort - dubbed the 'Peter Pan generation' - were reluctant to embrace the traditional markers of adulthood: a stable job, a house in the suburbs, a nuclear family. But do these emblems of maturity mean the same thing today as they did 30 years ago? In a smart and spirited enquiry, Doyle examines whether millennials are redefining what it means to be an adult today. Blending personal essay and cultural critique, she ventures into the big claims of philosophy and the neon buzz of pop culture to ask: in a rapidly changing world, do the so-called adult milestones distract us from other measures of maturity?