11 years old now in 2021 - what year born?


Today, 23 October 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 23 October 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 23 October 2010.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 12 years, year of birth 2008 or 2009
If now 25 years, year of birth 1995 or 1996
If now 97 years, year of birth 1923 or 1924

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