31 years old now in 2021 - what year born?


Today, 22 January 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 22 January 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 22 January 1990.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 17 years, year of birth 2003 or 2004
If now 20 years, year of birth 2000 or 2001
If now 92 years, year of birth 1928 or 1929

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