100 years old now in 2025 - what year born?

Today, 16 June 2025 if a person is 100 years old now, what year was he born? See below:

If 100 years old, year of birth is:
1924 or 1925*

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

If now 100 years and his year of birth 1924 if he was born after 16 June 1924 until 31 december 1924 inclusively, and his year of birth is 1925 if he was born from 1 January 1925 to 16 June 1925.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 16 years, year of birth 2008 or 2009
If now 28 years, year of birth 1996 or 1997
If now 32 years, year of birth 1992 or 1993

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