"Teacher Fei asked when the silence between them began to attract prying glances from the middle-aged proprietress of the diner, who sat behind the counter and studied the few occupied tables."

范老师问，他们两人之间的沉默已经开始引起饭馆中年老板娘的注意，她坐在柜台后面，打量着几张有食客的餐桌。

youdao

Our math teacher is a middle-aged man.

我们的数学老师是位中年男子。

youdao

The teacher is a middle aged fan of Argentinae tango.

老师是位热爱探戈的中年人。

youdao

The men described the fourth man, The Master, as a middle-aged, part-time teacher who hung around their window-and-door-making shop.

WSJ: On India's Streets, Women Run a Gantlet of Harassment