110 years old now in 2020 - what year born?


Today, 19 September 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 19 September 1909 until 31 december 1909 inclusively, and his year of birth is 1910 if he was born from 1 January 1910 to 19 September 1910.


Other examples:

If now 4 years, year of birth 2015 or 2016
If now 17 years, year of birth 2002 or 2003
If now 30 years, year of birth 1989 or 1990
If now 96 years, year of birth 1923 or 1924

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