109 years old now in 2021 - what year born?


Today, 3 August 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 3 August 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 3 August 1912.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 15 years, year of birth 2005 or 2006
If now 19 years, year of birth 2001 or 2002
If now 92 years, year of birth 1928 or 1929

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