3 years old now in 2020 - what year born?


Today, 22 September 2020 if a person is 3 years old now, what year was he born? See below:


If 3 years old, year of birth is:
2016 or 2017*
*It depends on whether he was born before or after 1 January 2017.


If now 3 years and his year of birth 2016 if he was born after 22 September 2016 until 31 december 2016 inclusively, and his year of birth is 2017 if he was born from 1 January 2017 to 22 September 2017.


Other examples:

If now 7 years, year of birth 2012 or 2013
If now 13 years, year of birth 2006 or 2007
If now 18 years, year of birth 2001 or 2002
If now 100 years, year of birth 1919 or 1920

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