47 years old now in 2021 - what year born?


Today, 15 April 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 15 April 1973 until 31 december 1973 inclusively, and his year of birth is 1974 if he was born from 1 January 1974 to 15 April 1974.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 12 years, year of birth 2008 or 2009
If now 23 years, year of birth 1997 or 1998
If now 58 years, year of birth 1962 or 1963

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