21 years old now in 2021 - what year born?


Today, 10 October 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 10 October 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 10 October 2000.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 12 years, year of birth 2008 or 2009
If now 30 years, year of birth 1990 or 1991
If now 47 years, year of birth 1973 or 1974

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