79 years old now in 2021 - what year born?


Today, 23 October 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 23 October 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 23 October 1942.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 16 years, year of birth 2004 or 2005
If now 21 years, year of birth 1999 or 2000
If now 39 years, year of birth 1981 or 1982

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