100 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 100 years old now, what year was he born? See below:


If 100 years old, year of birth is:
1919 or 1920*
*It depends on whether he was born before or after 1 January 1920.


If now 100 years and his year of birth 1919 if he was born after 27 October 1919 until 31 december 1919 inclusively, and his year of birth is 1920 if he was born from 1 January 1920 to 27 October 1920.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 17 years, year of birth 2002 or 2003
If now 22 years, year of birth 1997 or 1998
If now 98 years, year of birth 1921 or 1922

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