18 years old now in 2021 - what year born?


Today, 26 January 2021 if a person is 18 years old now, what year was he born? See below:


If 18 years old, year of birth is:
2002 or 2003*
*It depends on whether he was born before or after 1 January 2003.


If now 18 years and his year of birth 2002 if he was born after 26 January 2002 until 31 december 2002 inclusively, and his year of birth is 2003 if he was born from 1 January 2003 to 26 January 2003.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 14 years, year of birth 2006 or 2007
If now 23 years, year of birth 1997 or 1998
If now 62 years, year of birth 1958 or 1959

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