40 years old now in 2020 - what year born?


Today, 22 September 2020 if a person is 40 years old now, what year was he born? See below:


If 40 years old, year of birth is:
1979 or 1980*
*It depends on whether he was born before or after 1 January 1980.


If now 40 years and his year of birth 1979 if he was born after 22 September 1979 until 31 december 1979 inclusively, and his year of birth is 1980 if he was born from 1 January 1980 to 22 September 1980.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 17 years, year of birth 2002 or 2003
If now 30 years, year of birth 1989 or 1990
If now 86 years, year of birth 1933 or 1934

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