31 years old now in 2022 - what year born?


Today, 3 June 2022 if a person is 31 years old now, what year was he born? See below:


If 31 years old, year of birth is:
1990 or 1991*
*It depends on whether he was born before or after 1 January 1991.


If now 31 years and his year of birth 1990 if he was born after 3 June 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 3 June 1991.


Other examples:

If now 12 years, year of birth 2009 or 2010
If now 17 years, year of birth 2004 or 2005
If now 18 years, year of birth 2003 or 2004
If now 40 years, year of birth 1981 or 1982

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