84 years old now in 2021 - what year born?


Today, 10 October 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 10 October 1936 until 31 december 1936 inclusively, and his year of birth is 1937 if he was born from 1 January 1937 to 10 October 1937.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 18 years, year of birth 2002 or 2003
If now 19 years, year of birth 2001 or 2002
If now 45 years, year of birth 1975 or 1976

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