17 years old now in 2021 - what year born?


Today, 7 May 2021 if a person is 17 years old now, what year was he born? See below:


If 17 years old, year of birth is:
2003 or 2004*
*It depends on whether he was born before or after 1 January 2004.


If now 17 years and his year of birth 2003 if he was born after 7 May 2003 until 31 december 2003 inclusively, and his year of birth is 2004 if he was born from 1 January 2004 to 7 May 2004.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 15 years, year of birth 2005 or 2006
If now 28 years, year of birth 1992 or 1993
If now 52 years, year of birth 1968 or 1969

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