15 years old now in 2021 - what year born?


Today, 3 March 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 3 March 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 3 March 2006.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 12 years, year of birth 2008 or 2009
If now 18 years, year of birth 2002 or 2003
If now 98 years, year of birth 1922 or 1923

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