8 years old now in 2021 - what year born?


Today, 10 October 2021 if a person is 8 years old now, what year was he born? See below:


If 8 years old, year of birth is:
2012 or 2013*
*It depends on whether he was born before or after 1 January 2013.


If now 8 years and his year of birth 2012 if he was born after 10 October 2012 until 31 december 2012 inclusively, and his year of birth is 2013 if he was born from 1 January 2013 to 10 October 2013.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 17 years, year of birth 2003 or 2004
If now 20 years, year of birth 2000 or 2001
If now 50 years, year of birth 1970 or 1971

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