121 years old now in 2020 - what year born?


Today, 24 September 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 24 September 1898 until 31 december 1898 inclusively, and his year of birth is 1899 if he was born from 1 January 1899 to 24 September 1899.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 17 years, year of birth 2002 or 2003
If now 26 years, year of birth 1993 or 1994
If now 39 years, year of birth 1980 or 1981

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