12 years old now in 2021 - what year born?


Today, 14 April 2021 if a person is 12 years old now, what year was he born? See below:


If 12 years old, year of birth is:
2008 or 2009*
*It depends on whether he was born before or after 1 January 2009.


If now 12 years and his year of birth 2008 if he was born after 14 April 2008 until 31 december 2008 inclusively, and his year of birth is 2009 if he was born from 1 January 2009 to 14 April 2009.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 17 years, year of birth 2003 or 2004
If now 25 years, year of birth 1995 or 1996
If now 40 years, year of birth 1980 or 1981

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