64 years old now in 2020 - what year born?


Today, 23 November 2020 if a person is 64 years old now, what year was he born? See below:


If 64 years old, year of birth is:
1955 or 1956*
*It depends on whether he was born before or after 1 January 1956.


If now 64 years and his year of birth 1955 if he was born after 23 November 1955 until 31 december 1955 inclusively, and his year of birth is 1956 if he was born from 1 January 1956 to 23 November 1956.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 17 years, year of birth 2002 or 2003
If now 30 years, year of birth 1989 or 1990
If now 43 years, year of birth 1976 or 1977

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