14岁用英语怎么说？

14岁用英语可以说成"fourteen years old"。

关于这个说法的来源，"fourteen"是"14"的英语读音，"years"是表示年龄的单词，"old"表示年龄高。

下面是一些例句：

She is fourteen years old.

He will be fourteen years old next month.

My sister is fourteen years old, but she is very mature for her age.