long in the tooth

== English == === Etymology === Possibly from the practice of examining the length of horses’ teeth when estimating their ages: an old horse has long, rectangular incisors, and their occlusion angle is steep. Compare don't look a gift horse in the mouth. === Pronunciation === === Adjective === long in the tooth (idiomatic) Old; aged. ==== Synonyms ==== on in years, over the hill, wizened; see also Thesaurus:elderly ==== Related terms ==== don't look a gift horse in the mouth ==== Translations ==== === See also === make old bones