128 years old now in 2023 - what year born?

Today, 29 May 2023 if a person is 128 years old now, what year was he born? See below:

If 128 years old, year of birth is:
1894 or 1895*

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

If now 128 years and his year of birth 1894 if he was born after 29 May 1894 until 31 december 1894 inclusively, and his year of birth is 1895 if he was born from 1 January 1895 to 29 May 1895.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 16 years, year of birth 2006 or 2007
If now 21 years, year of birth 2001 or 2002
If now 94 years, year of birth 1928 or 1929

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