11 years old now in 2021 - what year born?


Today, 27 July 2021 if a person is 11 years old now, what year was he born? See below:


If 11 years old, year of birth is:
2009 or 2010*
*It depends on whether he was born before or after 1 January 2010.


If now 11 years and his year of birth 2009 if he was born after 27 July 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 27 July 2010.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 18 years, year of birth 2002 or 2003
If now 26 years, year of birth 1994 or 1995
If now 64 years, year of birth 1956 or 1957

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