118 years old now in 2023 - what year born?

Today, 7 December 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 7 December 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 7 December 1905.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 15 years, year of birth 2007 or 2008
If now 29 years, year of birth 1993 or 1994
If now 86 years, year of birth 1936 or 1937

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