13 years old now in 2021 - what year born?


Today, 31 July 2021 if a person is 13 years old now, what year was he born? See below:


If 13 years old, year of birth is:
2007 or 2008*
*It depends on whether he was born before or after 1 January 2008.


If now 13 years and his year of birth 2007 if he was born after 31 July 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 31 July 2008.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 15 years, year of birth 2005 or 2006
If now 26 years, year of birth 1994 or 1995
If now 89 years, year of birth 1931 or 1932

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