130 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1890 until 31 december 1890 inclusively, and his year of birth is 1891 if he was born from 1 January 1891 to 7 May 1891.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 15 years, year of birth 2005 or 2006
If now 26 years, year of birth 1994 or 1995
If now 56 years, year of birth 1964 or 1965

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