11 years old now in 2021 - what year born?


Today, 28 January 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 28 January 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 28 January 2010.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 12 years, year of birth 2008 or 2009
If now 29 years, year of birth 1991 or 1992
If now 55 years, year of birth 1965 or 1966

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