98 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 98 years old now, what year was he born? See below:

If 98 years old, year of birth is:
1926 or 1927*

*It depends on whether he was born before or after 1 January 1927.

If now 98 years and his year of birth 1926 if he was born after 19 December 1926 until 31 december 1926 inclusively, and his year of birth is 1927 if he was born from 1 January 1927 to 19 December 1927.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 18 years, year of birth 2006 or 2007
If now 21 years, year of birth 2003 or 2004
If now 54 years, year of birth 1970 or 1971

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