10 years old now in 2021 - what year born?


Today, 26 February 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 26 February 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 26 February 2011.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 17 years, year of birth 2003 or 2004
If now 30 years, year of birth 1990 or 1991
If now 84 years, year of birth 1936 or 1937

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