30 years old now in 2021 - what year born?


Today, 1 December 2021 if a person is 30 years old now, what year was he born? See below:


If 30 years old, year of birth is:
1990 or 1991*
*It depends on whether he was born before or after 1 January 1991.


If now 30 years and his year of birth 1990 if he was born after 1 December 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 1 December 1991.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 13 years, year of birth 2007 or 2008
If now 20 years, year of birth 2000 or 2001
If now 98 years, year of birth 1922 or 1923

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