80 years old now in 2021 - what year born?


Today, 14 April 2021 if a person is 80 years old now, what year was he born? See below:


If 80 years old, year of birth is:
1940 or 1941*
*It depends on whether he was born before or after 1 January 1941.


If now 80 years and his year of birth 1940 if he was born after 14 April 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 14 April 1941.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 13 years, year of birth 2007 or 2008
If now 20 years, year of birth 2000 or 2001
If now 65 years, year of birth 1955 or 1956

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