If you ask someone their age in Seoul, Tokyo and London, you might get three different answers — even if born on the same day. Age is a cultural calculation.
The Korean Age System
South Korea uses a system where everyone is one year old at birth. Nine months in the womb count as the first year. Then on January 1st everyone gains a year simultaneously.
The Chinese Lunar Age
Traditional Chinese reckoning also starts at one and increments at Lunar New Year — practical for agricultural societies tracking seasons rather than birthdays.
The next time someone asks your age, consider: the number you give them is a cultural choice as much as a biological one.