110 years old now in 2021 - what year born?


Today, 7 May 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 7 May 1910 until 31 december 1910 inclusively, and his year of birth is 1911 if he was born from 1 January 1911 to 7 May 1911.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 13 years, year of birth 2007 or 2008
If now 28 years, year of birth 1992 or 1993
If now 99 years, year of birth 1921 or 1922

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