47 years old now in 2021 - what year born?


Today, 23 October 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 23 October 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 23 October 1974.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 15 years, year of birth 2005 or 2006
If now 26 years, year of birth 1994 or 1995
If now 63 years, year of birth 1957 or 1958

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