123 years old now in 2021 - what year born?


Today, 10 November 2021 if a person is 123 years old now, what year was he born? See below:


If 123 years old, year of birth is:
1897 or 1898*
*It depends on whether he was born before or after 1 January 1898.


If now 123 years and his year of birth 1897 if he was born after 10 November 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 10 November 1898.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 13 years, year of birth 2007 or 2008
If now 30 years, year of birth 1990 or 1991
If now 52 years, year of birth 1968 or 1969

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