66 years old now in 2021 - what year born?


Today, 13 October 2021 if a person is 66 years old now, what year was he born? See below:


If 66 years old, year of birth is:
1954 or 1955*
*It depends on whether he was born before or after 1 January 1955.


If now 66 years and his year of birth 1954 if he was born after 13 October 1954 until 31 december 1954 inclusively, and his year of birth is 1955 if he was born from 1 January 1955 to 13 October 1955.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 17 years, year of birth 2003 or 2004
If now 19 years, year of birth 2001 or 2002
If now 51 years, year of birth 1969 or 1970

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