100 years old now in 2021 - what year born?


Today, 21 January 2021 if a person is 100 years old now, what year was he born? See below:


If 100 years old, year of birth is:
1920 or 1921*
*It depends on whether he was born before or after 1 January 1921.


If now 100 years and his year of birth 1920 if he was born after 21 January 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 21 January 1921.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 18 years, year of birth 2002 or 2003
If now 30 years, year of birth 1990 or 1991
If now 99 years, year of birth 1921 or 1922

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