20 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 20 years old now, what year was he born? See below:


If 20 years old, year of birth is:
1999 or 2000*
*It depends on whether he was born before or after 1 January 2000.


If now 20 years and his year of birth 1999 if he was born after 27 October 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 27 October 2000.


Other examples:

If now 8 years, year of birth 2011 or 2012
If now 17 years, year of birth 2002 or 2003
If now 24 years, year of birth 1995 or 1996
If now 51 years, year of birth 1968 or 1969

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