12 years old now in 2022 - what year born?


Today, 15 January 2022 if a person is 12 years old now, what year was he born? See below:


If 12 years old, year of birth is:
2009 or 2010*
*It depends on whether he was born before or after 1 January 2010.


If now 12 years and his year of birth 2009 if he was born after 15 January 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 15 January 2010.


Other examples:

If now 10 years, year of birth 2011 or 2012
If now 13 years, year of birth 2008 or 2009
If now 28 years, year of birth 1993 or 1994
If now 60 years, year of birth 1961 or 1962

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