120 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 120 years old now, what year was he born? See below:

If 120 years old, year of birth is:
1904 or 1905*

*It depends on whether he was born before or after 1 January 1905.

If now 120 years and his year of birth 1904 if he was born after 16 January 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 16 January 1905.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 18 years, year of birth 2006 or 2007
If now 27 years, year of birth 1997 or 1998
If now 85 years, year of birth 1939 or 1940

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