131 years old now in 2021 - what year born?


Today, 14 September 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 14 September 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 14 September 1890.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 14 years, year of birth 2006 or 2007
If now 18 years, year of birth 2002 or 2003
If now 85 years, year of birth 1935 or 1936

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