98 years old now in 2025 - what year born?

Today, 19 April 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 April 1926 until 31 december 1926 inclusively, and his year of birth is 1927 if he was born from 1 January 1927 to 19 April 1927.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 12 years, year of birth 2012 or 2013
If now 23 years, year of birth 2001 or 2002
If now 87 years, year of birth 1937 or 1938

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