80 years old now in 2021 - what year born?


Today, 18 January 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 18 January 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 18 January 1941.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 16 years, year of birth 2004 or 2005
If now 30 years, year of birth 1990 or 1991
If now 86 years, year of birth 1934 or 1935

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