97 years old now in 2023 - what year born?

Today, 23 September 2023 if a person is 97 years old now, what year was he born? See below:

If 97 years old, year of birth is:
1925 or 1926*

*It depends on whether he was born before or after 1 January 1926.

If now 97 years and his year of birth 1925 if he was born after 23 September 1925 until 31 december 1925 inclusively, and his year of birth is 1926 if he was born from 1 January 1926 to 23 September 1926.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 15 years, year of birth 2007 or 2008
If now 23 years, year of birth 1999 or 2000
If now 57 years, year of birth 1965 or 1966

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