30 years old now in 2023 - what year born?


Today, 1 February 2023 if a person is 30 years old now, what year was he born? See below:


If 30 years old, year of birth is:
1992 or 1993*
*It depends on whether he was born before or after 1 January 1993.


If now 30 years and his year of birth 1992 if he was born after 1 February 1992 until 31 december 1992 inclusively, and his year of birth is 1993 if he was born from 1 January 1993 to 1 February 1993.


Other examples:

If now 9 years, year of birth 2013 or 2014
If now 13 years, year of birth 2009 or 2010
If now 26 years, year of birth 1996 or 1997
If now 67 years, year of birth 1955 or 1956

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