80 years old now in 2020 - what year born?


Today, 21 October 2020 if a person is 80 years old now, what year was he born? See below:


If 80 years old, year of birth is:
1939 or 1940*
*It depends on whether he was born before or after 1 January 1940.


If now 80 years and his year of birth 1939 if he was born after 21 October 1939 until 31 december 1939 inclusively, and his year of birth is 1940 if he was born from 1 January 1940 to 21 October 1940.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 18 years, year of birth 2001 or 2002
If now 24 years, year of birth 1995 or 1996
If now 35 years, year of birth 1984 or 1985

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