118 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 118 years old now, what year was he born? See below:

If 118 years old, year of birth is:
1905 or 1906*

*It depends on whether he was born before or after 1 January 1906.

If now 118 years and his year of birth 1905 if he was born after 12 September 1905 until 31 december 1905 inclusively, and his year of birth is 1906 if he was born from 1 January 1906 to 12 September 1906.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 17 years, year of birth 2006 or 2007
If now 18 years, year of birth 2005 or 2006
If now 38 years, year of birth 1985 or 1986

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