9 years old now in 2020 - what year born?


Today, 28 November 2020 if a person is 9 years old now, what year was he born? See below:


If 9 years old, year of birth is:
2010 or 2011*
*It depends on whether he was born before or after 1 January 2011.


If now 9 years and his year of birth 2010 if he was born after 28 November 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 28 November 2011.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 17 years, year of birth 2002 or 2003
If now 20 years, year of birth 1999 or 2000
If now 96 years, year of birth 1923 or 1924

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