42 years old now in 2020 - what year born?


Today, 22 September 2020 if a person is 42 years old now, what year was he born? See below:


If 42 years old, year of birth is:
1977 or 1978*
*It depends on whether he was born before or after 1 January 1978.


If now 42 years and his year of birth 1977 if he was born after 22 September 1977 until 31 december 1977 inclusively, and his year of birth is 1978 if he was born from 1 January 1978 to 22 September 1978.


Other examples:

If now 7 years, year of birth 2012 or 2013
If now 15 years, year of birth 2004 or 2005
If now 29 years, year of birth 1990 or 1991
If now 93 years, year of birth 1926 or 1927

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