18 years old now in 2021 - what year born?


Today, 12 October 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 12 October 2002 until 31 december 2002 inclusively, and his year of birth is 2003 if he was born from 1 January 2003 to 12 October 2003.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 18 years, year of birth 2002 or 2003
If now 20 years, year of birth 2000 or 2001
If now 67 years, year of birth 1953 or 1954

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