117 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 117 years old now, what year was he born? See below:

If 117 years old, year of birth is:
1907 or 1908*

*It depends on whether he was born before or after 1 January 1908.

If now 117 years and his year of birth 1907 if he was born after 19 December 1907 until 31 december 1907 inclusively, and his year of birth is 1908 if he was born from 1 January 1908 to 19 December 1908.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 17 years, year of birth 2007 or 2008
If now 27 years, year of birth 1997 or 1998
If now 81 years, year of birth 1943 or 1944

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