18 years old now in 2023 - what year born?


Today, 1 February 2023 if a person is 18 years old now, what year was he born? See below:


If 18 years old, year of birth is:
2004 or 2005*
*It depends on whether he was born before or after 1 January 2005.


If now 18 years and his year of birth 2004 if he was born after 1 February 2004 until 31 december 2004 inclusively, and his year of birth is 2005 if he was born from 1 January 2005 to 1 February 2005.


Other examples:

If now 9 years, year of birth 2013 or 2014
If now 16 years, year of birth 2006 or 2007
If now 25 years, year of birth 1997 or 1998
If now 46 years, year of birth 1976 or 1977

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