80 years old now in 2022 - what year born?


Today, 27 April 2022 if a person is 80 years old now, what year was he born? See below:


If 80 years old, year of birth is:
1941 or 1942*
*It depends on whether he was born before or after 1 January 1942.


If now 80 years and his year of birth 1941 if he was born after 27 April 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 27 April 1942.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 18 years, year of birth 2003 or 2004
If now 29 years, year of birth 1992 or 1993
If now 92 years, year of birth 1929 or 1930

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