26 years old now in 2023 - what year born?

Today, 26 March 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 26 March 1996 until 31 december 1996 inclusively, and his year of birth is 1997 if he was born from 1 January 1997 to 26 March 1997.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 18 years, year of birth 2004 or 2005
If now 19 years, year of birth 2003 or 2004
If now 54 years, year of birth 1968 or 1969

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