117 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 117 years old now, what year was he born? See below:

If 117 years old, year of birth is:
1908 or 1909*

*It depends on whether he was born before or after 1 January 1909.

If now 117 years and his year of birth 1908 if he was born after 28 October 1908 until 31 december 1908 inclusively, and his year of birth is 1909 if he was born from 1 January 1909 to 28 October 1909.

Other examples:

If now 12 years, year of birth 2013 or 2014
If now 18 years, year of birth 2007 or 2008
If now 28 years, year of birth 1997 or 1998
If now 91 years, year of birth 1934 or 1935

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