109 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 109 years old now, what year was he born? See below:

If 109 years old, year of birth is:
1916 or 1917*

*It depends on whether he was born before or after 1 January 1917.

If now 109 years and his year of birth 1916 if he was born after 28 October 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 28 October 1917.

Other examples:

If now 12 years, year of birth 2013 or 2014
If now 13 years, year of birth 2012 or 2013
If now 28 years, year of birth 1997 or 1998
If now 71 years, year of birth 1954 or 1955

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