121 years old now in 2021 - what year born?


Today, 8 March 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 8 March 1899 until 31 december 1899 inclusively, and his year of birth is 1900 if he was born from 1 January 1900 to 8 March 1900.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 17 years, year of birth 2003 or 2004
If now 24 years, year of birth 1996 or 1997
If now 93 years, year of birth 1927 or 1928

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