79 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 7 May 1942.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 17 years, year of birth 2003 or 2004
If now 30 years, year of birth 1990 or 1991
If now 55 years, year of birth 1965 or 1966

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