131 years old now in 2021 - what year born?


Today, 8 March 2021 if a person is 131 years old now, what year was he born? See below:


If 131 years old, year of birth is:
1889 or 1890*
*It depends on whether he was born before or after 1 January 1890.


If now 131 years and his year of birth 1889 if he was born after 8 March 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 8 March 1890.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 14 years, year of birth 2006 or 2007
If now 19 years, year of birth 2001 or 2002
If now 84 years, year of birth 1936 or 1937

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