an old or elderly person.
(in the British navy) a midshipman of four years' standing.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use oldster in a sentence
"Calm down, Han," Rhes said in a quieter voice, taking the oldster's arms in both his hands.Deathworld | Harry Harrison
The bored-looking desk clerk—a withered-looking oldster who was probably a retired Starman—gave Alan his room number.Starman's Quest | Robert Silverberg
"I never guess," the oldster with the silver bar and the keystone-shaped red patch on his left shoulder replied.The Return | H. Beam Piper and John J. McGuire
“Done,” replied the oldster, throwing the contents of his hand at Jerry with all his force.The King's Own | Captain Frederick Marryat
For a moment, the oldster turned his attention from watching for the thing that was coming, and considered him fondly.The Natives | Katherine MacLean
British Dictionary definitions for oldster
informal an older person
British navy a person who has been a midshipman for four years
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012