130 years old now in 2021 - what year born?


Today, 22 September 2021 if a person is 130 years old now, what year was he born? See below:


If 130 years old, year of birth is:
1890 or 1891*
*It depends on whether he was born before or after 1 January 1891.


If now 130 years and his year of birth 1890 if he was born after 22 September 1890 until 31 december 1890 inclusively, and his year of birth is 1891 if he was born from 1 January 1891 to 22 September 1891.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 13 years, year of birth 2007 or 2008
If now 19 years, year of birth 2001 or 2002
If now 66 years, year of birth 1954 or 1955

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