100 years old now in 2021 - what year born?


Today, 12 September 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 12 September 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 12 September 1921.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 17 years, year of birth 2003 or 2004
If now 25 years, year of birth 1995 or 1996
If now 98 years, year of birth 1922 or 1923

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