“年龄层”是指一群年龄差不多的人，比如年轻人是一个年龄层，老人是另一个年龄层。

"年龄层" refers to a group of people of similar ages, such as young people being one 年龄层 and elderly people another.

我们常常用这个词来说一个产品或者节目适合哪些人看。

We often use this word to describe which people a product or program is suitable for.