30 years old now in 2020 - what year born?


Today, 21 September 2020 if a person is 30 years old now, what year was he born? See below:


If 30 years old, year of birth is:
1989 or 1990*
*It depends on whether he was born before or after 1 January 1990.


If now 30 years and his year of birth 1989 if he was born after 21 September 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 21 September 1990.


Other examples:

If now 7 years, year of birth 2012 or 2013
If now 15 years, year of birth 2004 or 2005
If now 22 years, year of birth 1997 or 1998
If now 88 years, year of birth 1931 or 1932

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