老成 ろうせい mature Also a form of 老成る ませる stem to be precocious Meanings na-adjective, noun, takes する, intransitive mature; experienced precocious; mature for one's age ひね also 陳 noun, rare becoming old rare grain or plant harvested more than a year ago Its kanji 老 ロウ · お.いる、ふ.ける old man, old age, grow old 成 セイ、ジョウ · な.る、な.す、-な.す turn into, become, get, grow, elapse, reach In sentences Furigana 老衰ろうすいするな！老成ろうせいせよ！ Don't grow old, grow wise! #75654