42 years old now in 2021 - what year born?


Today, 12 October 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 12 October 1978 until 31 december 1978 inclusively, and his year of birth is 1979 if he was born from 1 January 1979 to 12 October 1979.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 18 years, year of birth 2002 or 2003
If now 21 years, year of birth 1999 or 2000
If now 50 years, year of birth 1970 or 1971

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