109 years old now in 2021 - what year born?


Today, 28 November 2021 if a person is 109 years old now, what year was he born? See below:


If 109 years old, year of birth is:
1911 or 1912*
*It depends on whether he was born before or after 1 January 1912.


If now 109 years and his year of birth 1911 if he was born after 28 November 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 28 November 1912.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 16 years, year of birth 2004 or 2005
If now 23 years, year of birth 1997 or 1998
If now 95 years, year of birth 1925 or 1926

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