1. 中年的
    If you describe someone as middle-aged, you mean that they are neither young nor old. People between the ages of 40 and 60 are usually considered to be middle-aged.

    e.g. His sisters are grown up and his parents are middle-aged.
           他的姐妹们都已成人，而他的父母亲也人到中年。
    e.g. ...middleaged, married businessmen.
           已婚的中年商人

2. 具有中年人特点的;保守的;过时的
    If you describe someone''s activities or interests as middle-aged, you are critical of them because you think they are typical of a middle-aged person, for example by being conventional or old-fashioned.

    e.g. Her novels are middle-aged and boring.
           她的小说刻板乏味。

1. being roughly between 45 and 65 years old