少年老成

Explanation: Although still young people originally referred to, are very sophisticated. Young people now refer to a lack of vitality. 　　Usage: The main predicate; as predicate; with compliment 　　Source: Han Zhao Qi "Sansuke never recorded Wei Kang": "Wei Yuan to fifteen years, eight feet five inches in length, books for the princess. Yang Biao, said said: 'Way of the main book, though small, are aging and the wind , high-spirited horse a thousand miles'. " 　　Examples: Xuhua the middle, talking about Hing brother ~, such a major event, independent support for his loss. (Ming Feng Meng "Ancient and Modern Novel" Paper) 　　Riddle: Three-pronged Thesaurus:  not fond of playing in childhood