84 years old now in 2021 - what year born?


Today, 25 December 2021 if a person is 84 years old now, what year was he born? See below:


If 84 years old, year of birth is:
1936 or 1937*
*It depends on whether he was born before or after 1 January 1937.


If now 84 years and his year of birth 1936 if he was born after 25 December 1936 until 31 december 1936 inclusively, and his year of birth is 1937 if he was born from 1 January 1937 to 25 December 1937.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 18 years, year of birth 2002 or 2003
If now 22 years, year of birth 1998 or 1999
If now 55 years, year of birth 1965 or 1966

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