12 years old now in 2022 - what year born?


Today, 12 June 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 12 June 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 12 June 2010.


Other examples:

If now 3 years, year of birth 2018 or 2019
If now 16 years, year of birth 2005 or 2006
If now 18 years, year of birth 2003 or 2004
If now 93 years, year of birth 1928 or 1929

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