26 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 26 years old now, what year was he born? See below:

If 26 years old, year of birth is:
1996 or 1997*

*It depends on whether he was born before or after 1 January 1997.

If now 26 years and his year of birth 1996 if he was born after 24 September 1996 until 31 december 1996 inclusively, and his year of birth is 1997 if he was born from 1 January 1997 to 24 September 1997.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 18 years, year of birth 2004 or 2005
If now 23 years, year of birth 1999 or 2000
If now 73 years, year of birth 1949 or 1950

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