18 years old now in 2021 - what year born?


Today, 7 May 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 7 May 2002 until 31 december 2002 inclusively, and his year of birth is 2003 if he was born from 1 January 2003 to 7 May 2003.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 13 years, year of birth 2007 or 2008
If now 29 years, year of birth 1991 or 1992
If now 47 years, year of birth 1973 or 1974

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