64 years old now in 2021 - what year born?


Today, 7 May 2021 if a person is 64 years old now, what year was he born? See below:


If 64 years old, year of birth is:
1956 or 1957*
*It depends on whether he was born before or after 1 January 1957.


If now 64 years and his year of birth 1956 if he was born after 7 May 1956 until 31 december 1956 inclusively, and his year of birth is 1957 if he was born from 1 January 1957 to 7 May 1957.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 13 years, year of birth 2007 or 2008
If now 29 years, year of birth 1991 or 1992
If now 37 years, year of birth 1983 or 1984

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