121 years old now in 2020 - what year born?


Today, 26 November 2020 if a person is 121 years old now, what year was he born? See below:


If 121 years old, year of birth is:
1898 or 1899*
*It depends on whether he was born before or after 1 January 1899.


If now 121 years and his year of birth 1898 if he was born after 26 November 1898 until 31 december 1898 inclusively, and his year of birth is 1899 if he was born from 1 January 1899 to 26 November 1899.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 18 years, year of birth 2001 or 2002
If now 24 years, year of birth 1995 or 1996
If now 68 years, year of birth 1951 or 1952

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