64 years old now in 2020 - what year born?


Today, 22 September 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 22 September 1955 until 31 december 1955 inclusively, and his year of birth is 1956 if he was born from 1 January 1956 to 22 September 1956.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 15 years, year of birth 2004 or 2005
If now 26 years, year of birth 1993 or 1994
If now 75 years, year of birth 1944 or 1945

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