98 years old now in 2023 - what year born?

Today, 22 March 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 22 March 1924 until 31 december 1924 inclusively, and his year of birth is 1925 if he was born from 1 January 1925 to 22 March 1925.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 13 years, year of birth 2009 or 2010
If now 24 years, year of birth 1998 or 1999
If now 31 years, year of birth 1991 or 1992

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