"old resident" is correct and can be used in written English.
For example, "The old resident of the town was well-loved by the community."
A lawyer who spent the summer in Vermont had a neighbor, an old resident do a job for him.
"Cruz 30, Trump 22, Rubio 19," says Wyatt English, a 17-year old resident of Altoona.
Our children are sick". said a 40-year old resident of Basa named Fatuma.
R.B. is an 84-year-old resident of Painter, Va.
Take its 12-year-old resident Adrian Teniuch, for instance.
She is a 73-year-old resident of Rickmansworth, England.
"Of course, until now, Hezbollah is still ahead," said Abdullah Uleyan, an 18-year-old resident.
Education drew a dividing line for Nancy Vermeer, a 52-year-old resident of Sioux County.
"A wonderful thing about Edward, Karl Bissingerr, a ninety-one-year-old resident of Westbeth, said.
"The water keeps rising!" went the announcement, according to Somkiat Kalamad, a 34-year-old resident.
Police later confirmed that the man was a 28-year-old resident of Jerusalem.
