108 years old now in 2024 - what year born?

Today, 15 September 2024 if a person is 108 years old now, what year was he born? See below:

If 108 years old, year of birth is:
1915 or 1916*

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

If now 108 years and his year of birth 1915 if he was born after 15 September 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 15 September 1916.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 13 years, year of birth 2010 or 2011
If now 30 years, year of birth 1993 or 1994
If now 41 years, year of birth 1982 or 1983

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