128 years old now in 2021 - what year born?


Today, 20 June 2021 if a person is 128 years old now, what year was he born? See below:


If 128 years old, year of birth is:
1892 or 1893*
*It depends on whether he was born before or after 1 January 1893.


If now 128 years and his year of birth 1892 if he was born after 20 June 1892 until 31 december 1892 inclusively, and his year of birth is 1893 if he was born from 1 January 1893 to 20 June 1893.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 15 years, year of birth 2005 or 2006
If now 24 years, year of birth 1996 or 1997
If now 48 years, year of birth 1972 or 1973

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