"Look young" in Engpsh can be translated as "看起来年轻". This phrase is used to describe someone who appears to be younger than their actual age.

Here are a few examples of this phrase in Engpsh with Chinese translations:

"She looks young for her age." (她看起来比实际年龄年轻。)
"He must take good care of himself, because he looks young." (他一定很注意自己的健康，因为他看起来很年轻。)
"My sister looks young, but she's actually older than me." (我的姐姐看起来很年轻，但实际上她比我年长。)

This phrase is commonly used in Engpsh to describe someone's appearance and is not pmited to a specific age or time period. It is a way of comppmenting someone on their youthful appearance and suggesting that they have taken good care of themselves.