5 years old now in 2021 - what year born?


Today, 25 September 2021 if a person is 5 years old now, what year was he born? See below:


If 5 years old, year of birth is:
2015 or 2016*
*It depends on whether he was born before or after 1 January 2016.


If now 5 years and his year of birth 2015 if he was born after 25 September 2015 until 31 december 2015 inclusively, and his year of birth is 2016 if he was born from 1 January 2016 to 25 September 2016.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 13 years, year of birth 2007 or 2008
If now 26 years, year of birth 1994 or 1995
If now 91 years, year of birth 1929 or 1930

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