128 years old now in 2020 - what year born?


Today, 20 September 2020 if a person is 128 years old now, what year was he born? See below:


If 128 years old, year of birth is:
1891 or 1892*
*It depends on whether he was born before or after 1 January 1892.


If now 128 years and his year of birth 1891 if he was born after 20 September 1891 until 31 december 1891 inclusively, and his year of birth is 1892 if he was born from 1 January 1892 to 20 September 1892.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 16 years, year of birth 2003 or 2004
If now 25 years, year of birth 1994 or 1995
If now 39 years, year of birth 1980 or 1981

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