118 years old now in 2022 - what year born?

Today, 27 September 2022 if a person is 118 years old now, what year was he born? See below:

If 118 years old, year of birth is:
1903 or 1904*

*It depends on whether he was born before or after 1 January 1904.

If now 118 years and his year of birth 1903 if he was born after 27 September 1903 until 31 december 1903 inclusively, and his year of birth is 1904 if he was born from 1 January 1904 to 27 September 1904.

Other examples:

If now 5 years, year of birth 2016 or 2017
If now 18 years, year of birth 2003 or 2004
If now 19 years, year of birth 2002 or 2003
If now 41 years, year of birth 1980 or 1981

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