101 years old now in 2021 - what year born?


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


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 15 years, year of birth 2005 or 2006
If now 21 years, year of birth 1999 or 2000
If now 57 years, year of birth 1963 or 1964

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