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VMYa0 TIL in Korea, everyone is 1 from the time they are born. And everyone gets a year older on New Year’s day. So your Korean age is always either one or two years older than your Western age.
KaY4 TIL that in South Korea babies are considered 1 year old from the day they were born and then get 1 year older on New Year’s Day. There are calculators to convert international age into Korean age and vice versa.