7 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 7 years old now, what year was he born? See below:


If 7 years old, year of birth is:
2012 or 2013*
*It depends on whether he was born before or after 1 January 2013.


If now 7 years and his year of birth 2012 if he was born after 19 September 2012 until 31 december 2012 inclusively, and his year of birth is 2013 if he was born from 1 January 2013 to 19 September 2013.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 12 years, year of birth 2007 or 2008
If now 20 years, year of birth 1999 or 2000
If now 76 years, year of birth 1943 or 1944

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