13 years old now in 2022 - what year born?


Today, 1 October 2022 if a person is 13 years old now, what year was he born? See below:


If 13 years old, year of birth is:
2008 or 2009*
*It depends on whether he was born before or after 1 January 2009.


If now 13 years and his year of birth 2008 if he was born after 1 October 2008 until 31 december 2008 inclusively, and his year of birth is 2009 if he was born from 1 January 2009 to 1 October 2009.


Other examples:

If now 9 years, year of birth 2012 or 2013
If now 13 years, year of birth 2008 or 2009
If now 21 years, year of birth 2000 or 2001
If now 78 years, year of birth 1943 or 1944

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