131 years old now in 2021 - what year born?


Today, 20 June 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 20 June 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 20 June 1890.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 18 years, year of birth 2002 or 2003
If now 18 years, year of birth 2002 or 2003
If now 40 years, year of birth 1980 or 1981

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