21 years old now in 2022 - what year born?


Today, 6 December 2022 if a person is 21 years old now, what year was he born? See below:


If 21 years old, year of birth is:
2000 or 2001*
*It depends on whether he was born before or after 1 January 2001.


If now 21 years and his year of birth 2000 if he was born after 6 December 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 6 December 2001.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 16 years, year of birth 2005 or 2006
If now 21 years, year of birth 2000 or 2001
If now 100 years, year of birth 1921 or 1922

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