What is the word how old are you in Korean?

The Korean phrase for "how old are you" is 몇 살이세요? (myeot sal-i-seyo?)

Here's a breakdown:

* 몇 (myeot): means "how many"

* 살 (sal): means "year(s)"

* 이세요 (i-seyo): is the polite form of "are you"

This phrase is typically used when asking someone's age in a formal setting or to someone you don't know well.

For a more casual setting or when speaking to someone younger or someone you are close with, you can use 몇 살이야? (myeot sal-i-ya?). This is the informal version of the phrase.