9 years old now in 2022 - what year born?


Today, 6 December 2022 if a person is 9 years old now, what year was he born? See below:


If 9 years old, year of birth is:
2012 or 2013*
*It depends on whether he was born before or after 1 January 2013.


If now 9 years and his year of birth 2012 if he was born after 6 December 2012 until 31 december 2012 inclusively, and his year of birth is 2013 if he was born from 1 January 2013 to 6 December 2013.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 18 years, year of birth 2003 or 2004
If now 20 years, year of birth 2001 or 2002
If now 80 years, year of birth 1941 or 1942

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