107 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 107 years old now, what year was he born? See below:

If 107 years old, year of birth is:
1915 or 1916*

*It depends on whether he was born before or after 1 January 1916.

If now 107 years and his year of birth 1915 if he was born after 26 September 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 26 September 1916.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 15 years, year of birth 2007 or 2008
If now 28 years, year of birth 1994 or 1995
If now 43 years, year of birth 1979 or 1980

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