120 years old now in 2021 - what year born?


Today, 25 September 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 25 September 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 25 September 1901.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 17 years, year of birth 2003 or 2004
If now 27 years, year of birth 1993 or 1994
If now 36 years, year of birth 1984 or 1985

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