131 years old now in 2021 - what year born?


Today, 28 December 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 28 December 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 28 December 1890.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 13 years, year of birth 2007 or 2008
If now 26 years, year of birth 1994 or 1995
If now 67 years, year of birth 1953 or 1954

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