39 years old now in 2020 - what year born?


Today, 23 November 2020 if a person is 39 years old now, what year was he born? See below:


If 39 years old, year of birth is:
1980 or 1981*
*It depends on whether he was born before or after 1 January 1981.


If now 39 years and his year of birth 1980 if he was born after 23 November 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 23 November 1981.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 12 years, year of birth 2007 or 2008
If now 24 years, year of birth 1995 or 1996
If now 78 years, year of birth 1941 or 1942

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