109 years old now in 2021 - what year born?


Today, 14 April 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 14 April 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 14 April 1912.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 12 years, year of birth 2008 or 2009
If now 25 years, year of birth 1995 or 1996
If now 68 years, year of birth 1952 or 1953

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