5 years old now in 2020 - what year born?


Today, 20 September 2020 if a person is 5 years old now, what year was he born? See below:


If 5 years old, year of birth is:
2014 or 2015*
*It depends on whether he was born before or after 1 January 2015.


If now 5 years and his year of birth 2014 if he was born after 20 September 2014 until 31 december 2014 inclusively, and his year of birth is 2015 if he was born from 1 January 2015 to 20 September 2015.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 17 years, year of birth 2002 or 2003
If now 27 years, year of birth 1992 or 1993
If now 81 years, year of birth 1938 or 1939

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