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Use "oldish" in a sentence
"All Gotham is waiting to hear all about St. Philips 'choir; the boys are working hard and Mr. Kenney looks a little "oldish," but of course they'll do finely."
"It's the confidential stenographer who has been tampered with — you remember that middle-aged, youngish-oldish woman, Tom?"
"(I exclude series with titles along the lines of "a drama series about oldish ladies".)"