10 years old now in 2020 - what year born?


Today, 24 September 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 24 September 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 24 September 2010.


Other examples:

If now 3 years, year of birth 2016 or 2017
If now 15 years, year of birth 2004 or 2005
If now 26 years, year of birth 1993 or 1994
If now 46 years, year of birth 1973 or 1974

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