31 years old now in 2021 - what year born?


Today, 14 April 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 14 April 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 14 April 1990.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 12 years, year of birth 2008 or 2009
If now 28 years, year of birth 1992 or 1993
If now 40 years, year of birth 1980 or 1981

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