"A surprising fact that really shows South Korea is living in the future is its age counting system. If a baby is born on December 31, they will be 1 day old on January 1 of the next year, according to our system. Meanwhile, in South Korea, if a baby is born on the last day of the year, they are considered 1 year old; on the first day of the New Year, January 1, they will turn 2 years old. For official government documents, legal procedures, and age limits on beginning school, the international system is used, which is the one we are all so familiar with."