12 years old now in 2021 - what year born?


Today, 18 January 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 18 January 2008 until 31 december 2008 inclusively, and his year of birth is 2009 if he was born from 1 January 2009 to 18 January 2009.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 13 years, year of birth 2007 or 2008
If now 30 years, year of birth 1990 or 1991
If now 89 years, year of birth 1931 or 1932

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