30 years old now in 2022 - what year born?


Today, 27 September 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 27 September 1991 until 31 december 1991 inclusively, and his year of birth is 1992 if he was born from 1 January 1992 to 27 September 1992.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 14 years, year of birth 2007 or 2008
If now 21 years, year of birth 2000 or 2001
If now 66 years, year of birth 1955 or 1956

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