108 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 108 years old now, what year was he born? See below:

If 108 years old, year of birth is:
1917 or 1918*

*It depends on whether he was born before or after 1 January 1918.

If now 108 years and his year of birth 1917 if he was born after 28 October 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 28 October 1918.

Other examples:

If now 9 years, year of birth 2016 or 2017
If now 18 years, year of birth 2007 or 2008
If now 26 years, year of birth 1999 or 2000
If now 35 years, year of birth 1990 or 1991

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