31 years old now in 2021 - what year born?


Today, 4 August 2021 if a person is 31 years old now, what year was he born? See below:


If 31 years old, year of birth is:
1989 or 1990*
*It depends on whether he was born before or after 1 January 1990.


If now 31 years and his year of birth 1989 if he was born after 4 August 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 4 August 1990.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 14 years, year of birth 2006 or 2007
If now 29 years, year of birth 1991 or 1992
If now 90 years, year of birth 1930 or 1931

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