10 years old now in 2020 - what year born?


Today, 3 December 2020 if a person is 10 years old now, what year was he born? See below:


If 10 years old, year of birth is:
2009 or 2010*
*It depends on whether he was born before or after 1 January 2010.


If now 10 years and his year of birth 2009 if he was born after 3 December 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 3 December 2010.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 16 years, year of birth 2003 or 2004
If now 18 years, year of birth 2001 or 2002
If now 96 years, year of birth 1923 or 1924

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