47 years old now in 2021 - what year born?


Today, 26 January 2021 if a person is 47 years old now, what year was he born? See below:


If 47 years old, year of birth is:
1973 or 1974*
*It depends on whether he was born before or after 1 January 1974.


If now 47 years and his year of birth 1973 if he was born after 26 January 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 26 January 1974.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 14 years, year of birth 2006 or 2007
If now 28 years, year of birth 1992 or 1993
If now 32 years, year of birth 1988 or 1989

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