13 years old now in 2021 - what year born?


Today, 15 April 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 15 April 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 15 April 2008.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 14 years, year of birth 2006 or 2007
If now 27 years, year of birth 1993 or 1994
If now 67 years, year of birth 1953 or 1954

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