128 years old now in 2025 - what year born?

Today, 23 January 2025 if a person is 128 years old now, what year was he born? See below:

If 128 years old, year of birth is:
1896 or 1897*

*It depends on whether he was born before or after 1 January 1897.

If now 128 years and his year of birth 1896 if he was born after 23 January 1896 until 31 december 1896 inclusively, and his year of birth is 1897 if he was born from 1 January 1897 to 23 January 1897.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 15 years, year of birth 2009 or 2010
If now 27 years, year of birth 1997 or 1998
If now 32 years, year of birth 1992 or 1993

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