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That's always the difference between cardinal and ordinal counting of age.
Currently I'm 35, but I'm in my 36th year. The cultural decision to be "1 year old from birth to first anniversary" is just as valid as the decision to be "1 year old from first anniversary to birth".
We could just move Year 1 back to the actual year of Jesus's birth (probably 4BCE) and then this last year change would be completely meaningless.
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