123 years old now in 2023 - what year born?


Today, 31 January 2023 if a person is 123 years old now, what year was he born? See below:


If 123 years old, year of birth is:
1899 or 1900*
*It depends on whether he was born before or after 1 January 1900.


If now 123 years and his year of birth 1899 if he was born after 31 January 1899 until 31 december 1899 inclusively, and his year of birth is 1900 if he was born from 1 January 1900 to 31 January 1900.


Other examples:

If now 7 years, year of birth 2015 or 2016
If now 17 years, year of birth 2005 or 2006
If now 25 years, year of birth 1997 or 1998
If now 97 years, year of birth 1925 or 1926

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