17 years old now in 2020 - what year born?


Today, 23 September 2020 if a person is 17 years old now, what year was he born? See below:


If 17 years old, year of birth is:
2002 or 2003*
*It depends on whether he was born before or after 1 January 2003.


If now 17 years and his year of birth 2002 if he was born after 23 September 2002 until 31 december 2002 inclusively, and his year of birth is 2003 if he was born from 1 January 2003 to 23 September 2003.


Other examples:

If now 10 years, year of birth 2009 or 2010
If now 17 years, year of birth 2002 or 2003
If now 28 years, year of birth 1991 or 1992
If now 46 years, year of birth 1973 or 1974

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