140 years old now in 2021 - what year born?


Today, 10 September 2021 if a person is 140 years old now, what year was he born? See below:


If 140 years old, year of birth is:
1880 or 1881*
*It depends on whether he was born before or after 1 January 1881.


If now 140 years and his year of birth 1880 if he was born after 10 September 1880 until 31 december 1880 inclusively, and his year of birth is 1881 if he was born from 1 January 1881 to 10 September 1881.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 12 years, year of birth 2008 or 2009
If now 21 years, year of birth 1999 or 2000
If now 95 years, year of birth 1925 or 1926

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