4 years old now in 2021 - what year born?


Today, 28 September 2021 if a person is 4 years old now, what year was he born? See below:


If 4 years old, year of birth is:
2016 or 2017*
*It depends on whether he was born before or after 1 January 2017.


If now 4 years and his year of birth 2016 if he was born after 28 September 2016 until 31 december 2016 inclusively, and his year of birth is 2017 if he was born from 1 January 2017 to 28 September 2017.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 17 years, year of birth 2003 or 2004
If now 27 years, year of birth 1993 or 1994
If now 36 years, year of birth 1984 or 1985

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