42 years old now in 2021 - what year born?


Today, 29 July 2021 if a person is 42 years old now, what year was he born? See below:


If 42 years old, year of birth is:
1978 or 1979*
*It depends on whether he was born before or after 1 January 1979.


If now 42 years and his year of birth 1978 if he was born after 29 July 1978 until 31 december 1978 inclusively, and his year of birth is 1979 if he was born from 1 January 1979 to 29 July 1979.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 12 years, year of birth 2008 or 2009
If now 22 years, year of birth 1998 or 1999
If now 73 years, year of birth 1947 or 1948

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