10 years old now in 2021 - what year born?


Today, 5 August 2021 if a person is 10 years old now, what year was he born? See below:


If 10 years old, year of birth is:
2010 or 2011*
*It depends on whether he was born before or after 1 January 2011.


If now 10 years and his year of birth 2010 if he was born after 5 August 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 5 August 2011.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 13 years, year of birth 2007 or 2008
If now 25 years, year of birth 1995 or 1996
If now 66 years, year of birth 1954 or 1955

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