100 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 7 May 1921.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 16 years, year of birth 2004 or 2005
If now 29 years, year of birth 1991 or 1992
If now 65 years, year of birth 1955 or 1956

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