28 years old now in 2020 - what year born?


Today, 22 September 2020 if a person is 28 years old now, what year was he born? See below:


If 28 years old, year of birth is:
1991 or 1992*
*It depends on whether he was born before or after 1 January 1992.


If now 28 years and his year of birth 1991 if he was born after 22 September 1991 until 31 december 1991 inclusively, and his year of birth is 1992 if he was born from 1 January 1992 to 22 September 1992.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 17 years, year of birth 2002 or 2003
If now 20 years, year of birth 1999 or 2000
If now 41 years, year of birth 1978 or 1979

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