A baby born on Dec 31st is 1 year old, and the next day would be 2 years old ... A 2 day old baby would be considered 2 years old. Glad they decided that this was beyond odd.
Too bad they didn't keep their very own system of measurement which is so much more convenient than the internationally recognized and simple system... Not looking in anybody's direction
It's just semantics. When you are born, you are in your first year of life, not your zeroth year of life. After a full year, you are one year old. Grammar varies from language to language, and sometimes one feels more natural.
Imagine everyone in English said "I'm in my 32nd year" instead of "I'm 31 years old." Now you meet a foreigner who says the opposite. Translation issues abound!