140 years old now in 2020 - what year born?


Today, 23 November 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 23 November 1879 until 31 december 1879 inclusively, and his year of birth is 1880 if he was born from 1 January 1880 to 23 November 1880.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 15 years, year of birth 2004 or 2005
If now 24 years, year of birth 1995 or 1996
If now 34 years, year of birth 1985 or 1986

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