100 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 100 years old now, what year was he born? See below:

If 100 years old, year of birth is:
1925 or 1926*

*It depends on whether he was born before or after 1 January 1926.

If now 100 years and his year of birth 1925 if he was born after 28 October 1925 until 31 december 1925 inclusively, and his year of birth is 1926 if he was born from 1 January 1926 to 28 October 1926.

Other examples:

If now 9 years, year of birth 2016 or 2017
If now 17 years, year of birth 2008 or 2009
If now 23 years, year of birth 2002 or 2003
If now 33 years, year of birth 1992 or 1993

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