I don't Understand Korean age?

know if born later on in year 2 years old , if born earlier; 1. months make older? saying being born later on in year doesn't give detail, there 12 months in year go first 6 months; 1 years old , last 6 months 2? i've never read or seen 1 thing explained whole months thing, can please explain that?

i know if born later on in year 2 years old , if born earlier; 1. months make older? saying being born later on in year doesn't give detail, there 12 months in year go first 6 months; 1 years old , last 6 months are...

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