120 years old now in 2021 - what year born?


Today, 26 January 2021 if a person is 120 years old now, what year was he born? See below:


If 120 years old, year of birth is:
1900 or 1901*
*It depends on whether he was born before or after 1 January 1901.


If now 120 years and his year of birth 1900 if he was born after 26 January 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 26 January 1901.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 17 years, year of birth 2003 or 2004
If now 23 years, year of birth 1997 or 1998
If now 98 years, year of birth 1922 or 1923

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