21 years old now in 2021 - what year born?


Today, 25 January 2021 if a person is 21 years old now, what year was he born? See below:


If 21 years old, year of birth is:
1999 or 2000*
*It depends on whether he was born before or after 1 January 2000.


If now 21 years and his year of birth 1999 if he was born after 25 January 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 25 January 2000.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 18 years, year of birth 2002 or 2003
If now 29 years, year of birth 1991 or 1992
If now 31 years, year of birth 1989 or 1990

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