130 years old now in 2020 - what year born?


Today, 24 September 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 24 September 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 24 September 1890.


Other examples:

If now 9 years, year of birth 2010 or 2011
If now 16 years, year of birth 2003 or 2004
If now 19 years, year of birth 2000 or 2001
If now 85 years, year of birth 1934 or 1935

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