10 years old now in 2021 - what year born?


Today, 7 May 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 7 May 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 7 May 2011.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 13 years, year of birth 2007 or 2008
If now 19 years, year of birth 2001 or 2002
If now 73 years, year of birth 1947 or 1948

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