80 years old now in 2021 - what year born?


Today, 22 July 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 22 July 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 22 July 1941.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 18 years, year of birth 2002 or 2003
If now 28 years, year of birth 1992 or 1993
If now 92 years, year of birth 1928 or 1929

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