111 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 111 years old now, what year was he born? See below:


If 111 years old, year of birth is:
1908 or 1909*
*It depends on whether he was born before or after 1 January 1909.


If now 111 years and his year of birth 1908 if he was born after 19 September 1908 until 31 december 1908 inclusively, and his year of birth is 1909 if he was born from 1 January 1909 to 19 September 1909.


Other examples:

If now 10 years, year of birth 2009 or 2010
If now 12 years, year of birth 2007 or 2008
If now 18 years, year of birth 2001 or 2002
If now 60 years, year of birth 1959 or 1960

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