15 years old now in 2020 - what year born?


Today, 3 December 2020 if a person is 15 years old now, what year was he born? See below:


If 15 years old, year of birth is:
2004 or 2005*
*It depends on whether he was born before or after 1 January 2005.


If now 15 years and his year of birth 2004 if he was born after 3 December 2004 until 31 december 2004 inclusively, and his year of birth is 2005 if he was born from 1 January 2005 to 3 December 2005.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 15 years, year of birth 2004 or 2005
If now 25 years, year of birth 1994 or 1995
If now 40 years, year of birth 1979 or 1980

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