How do you say how old are Korean?

There isn't a single, direct translation of "How old are you?" in Korean that's appropriate for all situations. The way you ask someone's age depends on your relationship with them and the level of formality required.

Here are a few options:

* Formal (to someone older or someone you don't know well): 몇 살이세요? (myeot sal-i-seyo?) This is the most polite and respectful way to ask.

* Informal (to someone younger or a close friend): 몇 살이야? (myeot sal-i-ya?) This is much less formal and should only be used with people you are close to.

In both cases, "몇 살" (myeot sal) means "how many years old," and the verb ending changes based on formality. Adding "-세요" (-seyo) makes it polite, while "-야" (-ya) makes it informal.