15 years old now in 2020 - what year born?


Today, 24 September 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 24 September 2004 until 31 december 2004 inclusively, and his year of birth is 2005 if he was born from 1 January 2005 to 24 September 2005.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 12 years, year of birth 2007 or 2008
If now 20 years, year of birth 1999 or 2000
If now 70 years, year of birth 1949 or 1950

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