57 years old now in 2021 - what year born?


Today, 23 January 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 23 January 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 23 January 1964.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 16 years, year of birth 2004 or 2005
If now 30 years, year of birth 1990 or 1991
If now 48 years, year of birth 1972 or 1973

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