109 years old now in 2025 - what year born?

Today, 7 November 2025 if a person is 109 years old now, what year was he born? See below:

If 109 years old, year of birth is:
1915 or 1916*

*It depends on whether he was born before or after 1 January 1916.

If now 109 years and his year of birth 1915 if he was born after 7 November 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 7 November 1916.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 17 years, year of birth 2007 or 2008
If now 20 years, year of birth 2004 or 2005
If now 80 years, year of birth 1944 or 1945

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