4 years old now in 2020 - what year born?


Today, 1 December 2020 if a person is 4 years old now, what year was he born? See below:


If 4 years old, year of birth is:
2015 or 2016*
*It depends on whether he was born before or after 1 January 2016.


If now 4 years and his year of birth 2015 if he was born after 1 December 2015 until 31 december 2015 inclusively, and his year of birth is 2016 if he was born from 1 January 2016 to 1 December 2016.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 14 years, year of birth 2005 or 2006
If now 22 years, year of birth 1997 or 1998
If now 96 years, year of birth 1923 or 1924

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