金缕衣

劝君莫惜金缕衣，
劝君惜取少年时。
有花堪折直须折，
莫待无花空折枝。

I would advice you not to appreciate beautiful clothing,
I would advice you to appreciate your youth.
You should pluck the flower when it is there,
don't wait till the time when you can only pluck the branch as there is no more flowers for you.