15 years old now in 2021 - what year born?


Today, 5 August 2021 if a person is 15 years old now, what year was he born? See below:


If 15 years old, year of birth is:
2005 or 2006*
*It depends on whether he was born before or after 1 January 2006.


If now 15 years and his year of birth 2005 if he was born after 5 August 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 5 August 2006.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 18 years, year of birth 2002 or 2003
If now 21 years, year of birth 1999 or 2000
If now 69 years, year of birth 1951 or 1952

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