I think the most logical way to calculate the age is to using the present date to minus the birth date. Just like what you mentioned above. In fact, in my country, like your country, old people like to calculate the age based on Zodiac sign, leading to 1 year older.
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Sally-txlI am Chinese. At the family reunion dinner, my family member told me that I am 25 years old now. It shocked me as I don't understand how they calculate my age. I was born in Oct.2, 1988, so to calculate my age I just use 2012 minus 1988 and 24 left . As my birthday in 2012 is not coming yet , I would tell others that I am 23 years old. But my family member always