17 years old now in 2021 - what year born?


Today, 18 January 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 18 January 2003 until 31 december 2003 inclusively, and his year of birth is 2004 if he was born from 1 January 2004 to 18 January 2004.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 16 years, year of birth 2004 or 2005
If now 26 years, year of birth 1994 or 1995
If now 94 years, year of birth 1926 or 1927

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