3 years old now in 2021 - what year born?


Today, 7 May 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 7 May 2017 until 31 december 2017 inclusively, and his year of birth is 2018 if he was born from 1 January 2018 to 7 May 2018.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 15 years, year of birth 2005 or 2006
If now 22 years, year of birth 1998 or 1999
If now 94 years, year of birth 1926 or 1927

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