4 years old now in 2021 - what year born?


Today, 21 June 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 21 June 2016 until 31 december 2016 inclusively, and his year of birth is 2017 if he was born from 1 January 2017 to 21 June 2017.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 15 years, year of birth 2005 or 2006
If now 24 years, year of birth 1996 or 1997
If now 35 years, year of birth 1985 or 1986

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