118 years old now in 2023 - what year born?

Today, 31 January 2023 if a person is 118 years old now, what year was he born? See below:

If 118 years old, year of birth is:
1904 or 1905*

*It depends on whether he was born before or after 1 January 1905.

If now 118 years and his year of birth 1904 if he was born after 31 January 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 31 January 1905.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 17 years, year of birth 2005 or 2006
If now 26 years, year of birth 1996 or 1997
If now 76 years, year of birth 1946 or 1947

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