47 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 47 years old now, what year was he born? See below:


If 47 years old, year of birth is:
1972 or 1973*
*It depends on whether he was born before or after 1 January 1973.


If now 47 years and his year of birth 1972 if he was born after 27 October 1972 until 31 december 1972 inclusively, and his year of birth is 1973 if he was born from 1 January 1973 to 27 October 1973.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 18 years, year of birth 2001 or 2002
If now 21 years, year of birth 1998 or 1999
If now 76 years, year of birth 1943 or 1944

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