125 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 125 years old now, what year was he born? See below:

If 125 years old, year of birth is:
1898 or 1899*

*It depends on whether he was born before or after 1 January 1899.

If now 125 years and his year of birth 1898 if he was born after 4 December 1898 until 31 december 1898 inclusively, and his year of birth is 1899 if he was born from 1 January 1899 to 4 December 1899.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 16 years, year of birth 2007 or 2008
If now 24 years, year of birth 1999 or 2000
If now 36 years, year of birth 1987 or 1988

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