Just when you think you know some basic shit about the world, something like this comes across your radar. From the Economist:
"South Koreans woke up a year or two younger after their country scrapped its traditional method of counting age. Under the old system, South Koreans were considered a year old when they were born. A year was added to citizens’ age every January 1st. Babies born on New Year’s Eve became two the following day. The government has now adopted the internationally accepted method."
I had no idea.