131 years old now in 2020 - what year born?


Today, 28 November 2020 if a person is 131 years old now, what year was he born? See below:


If 131 years old, year of birth is:
1888 or 1889*
*It depends on whether he was born before or after 1 January 1889.


If now 131 years and his year of birth 1888 if he was born after 28 November 1888 until 31 december 1888 inclusively, and his year of birth is 1889 if he was born from 1 January 1889 to 28 November 1889.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 14 years, year of birth 2005 or 2006
If now 29 years, year of birth 1990 or 1991
If now 77 years, year of birth 1942 or 1943

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