63 years old now in 2021 - what year born?


Today, 28 July 2021 if a person is 63 years old now, what year was he born? See below:


If 63 years old, year of birth is:
1957 or 1958*
*It depends on whether he was born before or after 1 January 1958.


If now 63 years and his year of birth 1957 if he was born after 28 July 1957 until 31 december 1957 inclusively, and his year of birth is 1958 if he was born from 1 January 1958 to 28 July 1958.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 17 years, year of birth 2003 or 2004
If now 23 years, year of birth 1997 or 1998
If now 78 years, year of birth 1942 or 1943

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