26 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 26 years old now, what year was he born? See below:

If 26 years old, year of birth is:
1997 or 1998*

*It depends on whether he was born before or after 1 January 1998.

If now 26 years and his year of birth 1997 if he was born after 10 October 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 10 October 1998.

Other examples:

If now 7 years, year of birth 2016 or 2017
If now 13 years, year of birth 2010 or 2011
If now 23 years, year of birth 2000 or 2001
If now 75 years, year of birth 1948 or 1949

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