The 24-year-old frequents privately-held chain Crossroads Trading Co, where she buys brand-name goods secondhand at a discount, then sells the items back when she wants to refresh her look. Armour, a marketing manager for a nonprofit in Oakland, California, has picked up skirts and shirts, Oxford shoes for $30, a J.Crew trench coat for $40 and a Dooney & Bourke satchel for $150, less than half its retail price. For Millennials – the roughly 77 million Americans born between about 1980 and 2000 – the allure of “no ownership” is moving beyond housing and cars.