101 years old now in 2020 - what year born?


Today, 21 October 2020 if a person is 101 years old now, what year was he born? See below:


If 101 years old, year of birth is:
1918 or 1919*
*It depends on whether he was born before or after 1 January 1919.


If now 101 years and his year of birth 1918 if he was born after 21 October 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 21 October 1919.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 13 years, year of birth 2006 or 2007
If now 25 years, year of birth 1994 or 1995
If now 53 years, year of birth 1966 or 1967

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