133 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 133 years old now, what year was he born? See below:

If 133 years old, year of birth is:
1889 or 1890*

*It depends on whether he was born before or after 1 January 1890.

If now 133 years and his year of birth 1889 if he was born after 26 September 1889 until 31 december 1889 inclusively, and his year of birth is 1890 if he was born from 1 January 1890 to 26 September 1890.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 12 years, year of birth 2010 or 2011
If now 30 years, year of birth 1992 or 1993
If now 54 years, year of birth 1968 or 1969

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