15 years old now in 2021 - what year born?


Today, 16 May 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 16 May 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 16 May 2006.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 18 years, year of birth 2002 or 2003
If now 19 years, year of birth 2001 or 2002
If now 39 years, year of birth 1981 or 1982

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