59 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 59 years old now, what year was he born? See below:

If 59 years old, year of birth is:
1963 or 1964*

*It depends on whether he was born before or after 1 January 1964.

If now 59 years and his year of birth 1963 if he was born after 26 September 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 26 September 1964.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 15 years, year of birth 2007 or 2008
If now 30 years, year of birth 1992 or 1993
If now 46 years, year of birth 1976 or 1977

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