When my korean friend first told me this, I honestly thought they were messing with me. I still struggle to make sense of it. Must be a helluva birthday party on Jan 1st tho

I know there are studies on how birth date affects future success in school (though IIRC I read in Gladwell, and I'm wary of accurate his read on things are), I wonder if that effect is compounded with this system?

It's just a count of how many calendar years contain you.

It's the difference between "I was born in 2010" and "I am about 10.3 years old".

Americans do this a lot too, except at a (pseudo) decade level, e.g. "are you a '90s kid?"

> Americans do this a lot too, except at a (pseudo) decade level, e.g. "are you a '90s kid?"

This brings up other ambiguities. A "90's kid" might have been born in the 80's.

Yes, it’s not a clean mapping

They're in their second year.