84 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 84 years old now, what year was he born? See below:


If 84 years old, year of birth is:
1935 or 1936*
*It depends on whether he was born before or after 1 January 1936.


If now 84 years and his year of birth 1935 if he was born after 19 September 1935 until 31 december 1935 inclusively, and his year of birth is 1936 if he was born from 1 January 1936 to 19 September 1936.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 16 years, year of birth 2003 or 2004
If now 28 years, year of birth 1991 or 1992
If now 40 years, year of birth 1979 or 1980

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