nidan verb (upper class) with 'yu' ending (archaic), intransitive verb
Archaic Nidan verb; the modern equivalent is 老いる (おいる). Found in classical texts and poetry.
See also: 老いる
「老ゆる身に秋の夕べはしみじみと」と古歌にある。
An old poem says, 'For an aging body, an autumn evening is deeply felt.'