110 years old now in 2020 - what year born?


Today, 25 November 2020 if a person is 110 years old now, what year was he born? See below:


If 110 years old, year of birth is:
1909 or 1910*
*It depends on whether he was born before or after 1 January 1910.


If now 110 years and his year of birth 1909 if he was born after 25 November 1909 until 31 december 1909 inclusively, and his year of birth is 1910 if he was born from 1 January 1910 to 25 November 1910.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 15 years, year of birth 2004 or 2005
If now 21 years, year of birth 1998 or 1999
If now 97 years, year of birth 1922 or 1923

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