39 years old now in 2020 - what year born?


Today, 23 September 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 September 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 23 September 1981.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 18 years, year of birth 2001 or 2002
If now 19 years, year of birth 2000 or 2001
If now 79 years, year of birth 1940 or 1941

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