98 years old now in 2023 - what year born?

Today, 23 September 2023 if a person is 98 years old now, what year was he born? See below:

If 98 years old, year of birth is:
1924 or 1925*

*It depends on whether he was born before or after 1 January 1925.

If now 98 years and his year of birth 1924 if he was born after 23 September 1924 until 31 december 1924 inclusively, and his year of birth is 1925 if he was born from 1 January 1925 to 23 September 1925.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 13 years, year of birth 2009 or 2010
If now 27 years, year of birth 1995 or 1996
If now 36 years, year of birth 1986 or 1987

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