129 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 129 years old now, what year was he born? See below:

If 129 years old, year of birth is:
1893 or 1894*

*It depends on whether he was born before or after 1 January 1894.

If now 129 years and his year of birth 1893 if he was born after 26 September 1893 until 31 december 1893 inclusively, and his year of birth is 1894 if he was born from 1 January 1894 to 26 September 1894.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 14 years, year of birth 2008 or 2009
If now 22 years, year of birth 2000 or 2001
If now 32 years, year of birth 1990 or 1991

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