120 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1900 until 31 december 1900 inclusively, and his year of birth is 1901 if he was born from 1 January 1901 to 7 May 1901.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 15 years, year of birth 2005 or 2006
If now 26 years, year of birth 1994 or 1995
If now 72 years, year of birth 1948 or 1949

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