57 years old now in 2021 - what year born?


Today, 5 August 2021 if a person is 57 years old now, what year was he born? See below:


If 57 years old, year of birth is:
1963 or 1964*
*It depends on whether he was born before or after 1 January 1964.


If now 57 years and his year of birth 1963 if he was born after 5 August 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 5 August 1964.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 17 years, year of birth 2003 or 2004
If now 18 years, year of birth 2002 or 2003
If now 97 years, year of birth 1923 or 1924

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