13 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 13 years old now, what year was he born? See below:


If 13 years old, year of birth is:
2006 or 2007*
*It depends on whether he was born before or after 1 January 2007.


If now 13 years and his year of birth 2006 if he was born after 27 October 2006 until 31 december 2006 inclusively, and his year of birth is 2007 if he was born from 1 January 2007 to 27 October 2007.


Other examples:

If now 10 years, year of birth 2009 or 2010
If now 18 years, year of birth 2001 or 2002
If now 27 years, year of birth 1992 or 1993
If now 65 years, year of birth 1954 or 1955

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