39 years old now in 2021 - what year born?


Today, 17 September 2021 if a person is 39 years old now, what year was he born? See below:


If 39 years old, year of birth is:
1981 or 1982*
*It depends on whether he was born before or after 1 January 1982.


If now 39 years and his year of birth 1981 if he was born after 17 September 1981 until 31 december 1981 inclusively, and his year of birth is 1982 if he was born from 1 January 1982 to 17 September 1982.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 16 years, year of birth 2004 or 2005
If now 25 years, year of birth 1995 or 1996
If now 81 years, year of birth 1939 or 1940

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