4 years old now in 2020 - what year born?


Today, 19 September 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 19 September 2015 until 31 december 2015 inclusively, and his year of birth is 2016 if he was born from 1 January 2016 to 19 September 2016.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 16 years, year of birth 2003 or 2004
If now 21 years, year of birth 1998 or 1999
If now 36 years, year of birth 1983 or 1984

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