47 years old now in 2021 - what year born?


Today, 25 July 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 25 July 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 25 July 1974.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 16 years, year of birth 2004 or 2005
If now 29 years, year of birth 1991 or 1992
If now 58 years, year of birth 1962 or 1963

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