121 years old now in 2021 - what year born?


Today, 19 June 2021 if a person is 121 years old now, what year was he born? See below:


If 121 years old, year of birth is:
1899 or 1900*
*It depends on whether he was born before or after 1 January 1900.


If now 121 years and his year of birth 1899 if he was born after 19 June 1899 until 31 december 1899 inclusively, and his year of birth is 1900 if he was born from 1 January 1900 to 19 June 1900.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 14 years, year of birth 2006 or 2007
If now 23 years, year of birth 1997 or 1998
If now 41 years, year of birth 1979 or 1980

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