9 years old now in 2021 - what year born?


Today, 23 October 2021 if a person is 9 years old now, what year was he born? See below:


If 9 years old, year of birth is:
2011 or 2012*
*It depends on whether he was born before or after 1 January 2012.


If now 9 years and his year of birth 2011 if he was born after 23 October 2011 until 31 december 2011 inclusively, and his year of birth is 2012 if he was born from 1 January 2012 to 23 October 2012.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 15 years, year of birth 2005 or 2006
If now 20 years, year of birth 2000 or 2001
If now 94 years, year of birth 1926 or 1927

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