young invincible
n.— «The company is now rolling out Tonik or similar products nationwide, aiming for what it refers to as “young invincibles,” Americans 19 through their early 30s who tend not to have health insurance.» —“WellPoint offers Tonik to the young” by Ferdie De Vega Desert Sun (Palm Springs, California) Jan. 11, 2006. (source: Double-Tongued Dictionary)