21 years old now in 2022 - what year born?


Today, 14 June 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 14 June 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 14 June 2001.


Other examples:

If now 4 years, year of birth 2017 or 2018
If now 18 years, year of birth 2003 or 2004
If now 22 years, year of birth 1999 or 2000
If now 50 years, year of birth 1971 or 1972

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