57 years old now in 2021 - what year born?


Today, 17 May 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 17 May 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 17 May 1964.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 16 years, year of birth 2004 or 2005
If now 23 years, year of birth 1997 or 1998
If now 68 years, year of birth 1952 or 1953

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