101 years old now in 2021 - what year born?


Today, 25 January 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 25 January 1919 until 31 december 1919 inclusively, and his year of birth is 1920 if he was born from 1 January 1920 to 25 January 1920.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 16 years, year of birth 2004 or 2005
If now 23 years, year of birth 1997 or 1998
If now 52 years, year of birth 1968 or 1969

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