30 years old now in 2021 - what year born?


Today, 28 January 2021 if a person is 30 years old now, what year was he born? See below:


If 30 years old, year of birth is:
1990 or 1991*
*It depends on whether he was born before or after 1 January 1991.


If now 30 years and his year of birth 1990 if he was born after 28 January 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 28 January 1991.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 18 years, year of birth 2002 or 2003
If now 27 years, year of birth 1993 or 1994
If now 85 years, year of birth 1935 or 1936

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