79 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 79 years old now, what year was he born? See below:


If 79 years old, year of birth is:
1940 or 1941*
*It depends on whether he was born before or after 1 January 1941.


If now 79 years and his year of birth 1940 if he was born after 19 September 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 19 September 1941.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 16 years, year of birth 2003 or 2004
If now 25 years, year of birth 1994 or 1995
If now 75 years, year of birth 1944 or 1945

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