12 years old now in 2020 - what year born?


Today, 21 October 2020 if a person is 12 years old now, what year was he born? See below:


If 12 years old, year of birth is:
2007 or 2008*
*It depends on whether he was born before or after 1 January 2008.


If now 12 years and his year of birth 2007 if he was born after 21 October 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 21 October 2008.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 12 years, year of birth 2007 or 2008
If now 23 years, year of birth 1996 or 1997
If now 64 years, year of birth 1955 or 1956

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