oldsterEtymologyFrom old + -ster, modelled after youngster. Attested from early 19th c.oldster means someone who is old. Lexicurio rates it Sui generis — a strength score of 89 out of 100.nounSomeone who is old.“The oldsters start squabbling about whose memory is better. “It was cold that day,” one says about some faraway memory. “What are you talking about? It was May, late May,” says another.”A midshipman of four years' standing; a master's mate.