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To be fair, this is also a matter of culture and convention.

> - In Korea, you are already one year old when you are born. > - In Korea, you "age" a year every New Year rather than on your birthday

If the Korean child is born on the 31st of December at 23:59 it will be 2 years old and 2 minutes old at the same time.

that's interesting. How do they figure out school cohorts with such a system?

So if you're born on the 31st of January, you're two years old one day later?

December* and yes