40 years old now in 2020 - what year born?


Today, 29 November 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 29 November 1979 until 31 december 1979 inclusively, and his year of birth is 1980 if he was born from 1 January 1980 to 29 November 1980.


Other examples:

If now 10 years, year of birth 2009 or 2010
If now 16 years, year of birth 2003 or 2004
If now 28 years, year of birth 1991 or 1992
If now 94 years, year of birth 1925 or 1926

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