101 years old now in 2021 - what year born?


Today, 11 October 2021 if a person is 101 years old now, what year was he born? See below:


If 101 years old, year of birth is:
1919 or 1920*
*It depends on whether he was born before or after 1 January 1920.


If now 101 years and his year of birth 1919 if he was born after 11 October 1919 until 31 december 1919 inclusively, and his year of birth is 1920 if he was born from 1 January 1920 to 11 October 1920.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 16 years, year of birth 2004 or 2005
If now 29 years, year of birth 1991 or 1992
If now 47 years, year of birth 1973 or 1974

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