3 years old now in 2021 - what year born?


Today, 28 January 2021 if a person is 3 years old now, what year was he born? See below:


If 3 years old, year of birth is:
2017 or 2018*
*It depends on whether he was born before or after 1 January 2018.


If now 3 years and his year of birth 2017 if he was born after 28 January 2017 until 31 december 2017 inclusively, and his year of birth is 2018 if he was born from 1 January 2018 to 28 January 2018.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 14 years, year of birth 2006 or 2007
If now 26 years, year of birth 1994 or 1995
If now 95 years, year of birth 1925 or 1926

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