140 years old now in 2020 - what year born?


Today, 22 September 2020 if a person is 140 years old now, what year was he born? See below:


If 140 years old, year of birth is:
1879 or 1880*
*It depends on whether he was born before or after 1 January 1880.


If now 140 years and his year of birth 1879 if he was born after 22 September 1879 until 31 december 1879 inclusively, and his year of birth is 1880 if he was born from 1 January 1880 to 22 September 1880.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 18 years, year of birth 2001 or 2002
If now 18 years, year of birth 2001 or 2002
If now 41 years, year of birth 1978 or 1979

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