117 years old now in 2025 - what year born?

Today, 20 March 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 20 March 1907 until 31 december 1907 inclusively, and his year of birth is 1908 if he was born from 1 January 1908 to 20 March 1908.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 12 years, year of birth 2012 or 2013
If now 18 years, year of birth 2006 or 2007
If now 35 years, year of birth 1989 or 1990

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