110 years old now in 2021 - what year born?


Today, 11 September 2021 if a person is 110 years old now, what year was he born? See below:


If 110 years old, year of birth is:
1910 or 1911*
*It depends on whether he was born before or after 1 January 1911.


If now 110 years and his year of birth 1910 if he was born after 11 September 1910 until 31 december 1910 inclusively, and his year of birth is 1911 if he was born from 1 January 1911 to 11 September 1911.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 13 years, year of birth 2007 or 2008
If now 22 years, year of birth 1998 or 1999
If now 40 years, year of birth 1980 or 1981

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