130 years old now in 2020 - what year born?


Today, 3 December 2020 if a person is 130 years old now, what year was he born? See below:


If 130 years old, year of birth is:
1889 or 1890*
*It depends on whether he was born before or after 1 January 1890.


If now 130 years and his year of birth 1889 if he was born after 3 December 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 3 December 1890.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 13 years, year of birth 2006 or 2007
If now 23 years, year of birth 1996 or 1997
If now 65 years, year of birth 1954 or 1955

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