How do you say "how old are you ?" in Korean ?
I know how to say my age but I don't know how to ask someone's age.

Question

Answer

You can say either...........

"나이가 어떻게 되세요? (na-i-ga eo-tteoh-ge doe-se-yo?)" or 
"몇 살이세요? (myeot sal-i-se-yo?)"

in an informal and polite way.^^'

\^o^/

Answer

나이가 몇 살이에요? (informal, used to ask the younger or the same persons)
 연세가 어떻게 되세요? (formal, used to ask the older persons)