125 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 125 years old now, what year was he born? See below:

If 125 years old, year of birth is:
1897 or 1898*

*It depends on whether he was born before or after 1 January 1898.

If now 125 years and his year of birth 1897 if he was born after 7 December 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 7 December 1898.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 16 years, year of birth 2006 or 2007
If now 18 years, year of birth 2004 or 2005
If now 46 years, year of birth 1976 or 1977

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