10 years old now in 2021 - what year born?


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


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 12 years, year of birth 2008 or 2009
If now 25 years, year of birth 1995 or 1996
If now 97 years, year of birth 1923 or 1924

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