80 years old now in 2021 - what year born?


Today, 12 October 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 12 October 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 12 October 1941.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 18 years, year of birth 2002 or 2003
If now 21 years, year of birth 1999 or 2000
If now 61 years, year of birth 1959 or 1960

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