“十六七”是“十六七岁”或“十六七个”的意思，用来说一个大概的数字。

"十六七" means "about sixteen or seventeen years old" or "about sixteen or seventeen of something," used to indicate an approximate number.

人们说话的时候常用它来表示不太确定的年龄或数量。

People often use it in speech to express an uncertain age or quantity.