13 years old now in 2021 - what year born?


Today, 26 January 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 26 January 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 26 January 2008.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 18 years, year of birth 2002 or 2003
If now 22 years, year of birth 1998 or 1999
If now 65 years, year of birth 1955 or 1956

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