79 years old now in 2021 - what year born?


Today, 31 July 2021 if a person is 79 years old now, what year was he born? See below:


If 79 years old, year of birth is:
1941 or 1942*
*It depends on whether he was born before or after 1 January 1942.


If now 79 years and his year of birth 1941 if he was born after 31 July 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 31 July 1942.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 14 years, year of birth 2006 or 2007
If now 20 years, year of birth 2000 or 2001
If now 67 years, year of birth 1953 or 1954

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