142 years old now in 2021 - what year born?


Today, 7 May 2021 if a person is 142 years old now, what year was he born? See below:


If 142 years old, year of birth is:
1878 or 1879*
*It depends on whether he was born before or after 1 January 1879.


If now 142 years and his year of birth 1878 if he was born after 7 May 1878 until 31 december 1878 inclusively, and his year of birth is 1879 if he was born from 1 January 1879 to 7 May 1879.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 16 years, year of birth 2004 or 2005
If now 22 years, year of birth 1998 or 1999
If now 91 years, year of birth 1929 or 1930

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