78 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 78 years old now, what year was he born? See below:


If 78 years old, year of birth is:
1941 or 1942*
*It depends on whether he was born before or after 1 January 1942.


If now 78 years and his year of birth 1941 if he was born after 19 September 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 19 September 1942.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 13 years, year of birth 2006 or 2007
If now 22 years, year of birth 1997 or 1998
If now 39 years, year of birth 1980 or 1981

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