123 years old now in 2020 - what year born?


Today, 3 December 2020 if a person is 123 years old now, what year was he born? See below:


If 123 years old, year of birth is:
1896 or 1897*
*It depends on whether he was born before or after 1 January 1897.


If now 123 years and his year of birth 1896 if he was born after 3 December 1896 until 31 december 1896 inclusively, and his year of birth is 1897 if he was born from 1 January 1897 to 3 December 1897.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 18 years, year of birth 2001 or 2002
If now 26 years, year of birth 1993 or 1994
If now 100 years, year of birth 1919 or 1920

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