mature adult

• 成熟

mature adult的用法和样例：

例句

1. You are now considered a mature,responsible adult.
   你现在已被看成一个成熟的，有责任感的成年人了。
2. His niece is attractive and mature for her age.
   以他的侄女的年纪而言，她既有媚力又成熟。