30 years old now in 2022 - what year born?


Today, 9 June 2022 if a person is 30 years old now, what year was he born? See below:


If 30 years old, year of birth is:
1991 or 1992*
*It depends on whether he was born before or after 1 January 1992.


If now 30 years and his year of birth 1991 if he was born after 9 June 1991 until 31 december 1991 inclusively, and his year of birth is 1992 if he was born from 1 January 1992 to 9 June 1992.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 17 years, year of birth 2004 or 2005
If now 18 years, year of birth 2003 or 2004
If now 98 years, year of birth 1923 or 1924

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