129 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 129 years old now, what year was he born? See below:

If 129 years old, year of birth is:
1894 or 1895*

*It depends on whether he was born before or after 1 January 1895.

If now 129 years and his year of birth 1894 if he was born after 15 October 1894 until 31 december 1894 inclusively, and his year of birth is 1895 if he was born from 1 January 1895 to 15 October 1895.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 18 years, year of birth 2005 or 2006
If now 19 years, year of birth 2004 or 2005
If now 35 years, year of birth 1988 or 1989

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