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Comment by alexey-salmin

5 days ago

Which cultures settled on ceil(age)?

The traditional system in China and its surroundings, 虛歲, is that you're born at the age of 1 and your age increases on the new year.

As the sibling comment mentioned, I was thinking of East Asian countries.

There's another difference in that age++ there happens on Chinese New Year and not your own birthday, but that's an orthogonal point to the rounding, I think.