5 years old now in 2021 - what year born?


Today, 7 May 2021 if a person is 5 years old now, what year was he born? See below:


If 5 years old, year of birth is:
2015 or 2016*
*It depends on whether he was born before or after 1 January 2016.


If now 5 years and his year of birth 2015 if he was born after 7 May 2015 until 31 december 2015 inclusively, and his year of birth is 2016 if he was born from 1 January 2016 to 7 May 2016.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 18 years, year of birth 2002 or 2003
If now 20 years, year of birth 2000 or 2001
If now 82 years, year of birth 1938 or 1939

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