15 years old now in 2021 - what year born?


Today, 28 November 2021 if a person is 15 years old now, what year was he born? See below:


If 15 years old, year of birth is:
2005 or 2006*
*It depends on whether he was born before or after 1 January 2006.


If now 15 years and his year of birth 2005 if he was born after 28 November 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 28 November 2006.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 14 years, year of birth 2006 or 2007
If now 26 years, year of birth 1994 or 1995
If now 61 years, year of birth 1959 or 1960

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