142 years old now in 2021 - what year born?


Today, 25 September 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 25 September 1878 until 31 december 1878 inclusively, and his year of birth is 1879 if he was born from 1 January 1879 to 25 September 1879.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 13 years, year of birth 2007 or 2008
If now 20 years, year of birth 2000 or 2001
If now 94 years, year of birth 1926 or 1927

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