21 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 21 years old now, what year was he born? See below:


If 21 years old, year of birth is:
1998 or 1999*
*It depends on whether he was born before or after 1 January 1999.


If now 21 years and his year of birth 1998 if he was born after 27 October 1998 until 31 december 1998 inclusively, and his year of birth is 1999 if he was born from 1 January 1999 to 27 October 1999.


Other examples:

If now 8 years, year of birth 2011 or 2012
If now 16 years, year of birth 2003 or 2004
If now 22 years, year of birth 1997 or 1998
If now 74 years, year of birth 1945 or 1946

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