129 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 129 years old now, what year was he born? See below:


If 129 years old, year of birth is:
1890 or 1891*
*It depends on whether he was born before or after 1 January 1891.


If now 129 years and his year of birth 1890 if he was born after 27 October 1890 until 31 december 1890 inclusively, and his year of birth is 1891 if he was born from 1 January 1891 to 27 October 1891.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 16 years, year of birth 2003 or 2004
If now 28 years, year of birth 1991 or 1992
If now 85 years, year of birth 1934 or 1935

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