11 years old now in 2022 - what year born?


Today, 6 December 2022 if a person is 11 years old now, what year was he born? See below:


If 11 years old, year of birth is:
2010 or 2011*
*It depends on whether he was born before or after 1 January 2011.


If now 11 years and his year of birth 2010 if he was born after 6 December 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 6 December 2011.


Other examples:

If now 10 years, year of birth 2011 or 2012
If now 18 years, year of birth 2003 or 2004
If now 21 years, year of birth 2000 or 2001
If now 63 years, year of birth 1958 or 1959

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