142 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 142 years old now, what year was he born? See below:


If 142 years old, year of birth is:
1877 or 1878*
*It depends on whether he was born before or after 1 January 1878.


If now 142 years and his year of birth 1877 if he was born after 27 October 1877 until 31 december 1877 inclusively, and his year of birth is 1878 if he was born from 1 January 1878 to 27 October 1878.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 18 years, year of birth 2001 or 2002
If now 23 years, year of birth 1996 or 1997
If now 100 years, year of birth 1919 or 1920

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