104 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 104 years old now, what year was he born? See below:

If 104 years old, year of birth is:
1919 or 1920*

*It depends on whether he was born before or after 1 January 1920.

If now 104 years and his year of birth 1919 if he was born after 10 October 1919 until 31 december 1919 inclusively, and his year of birth is 1920 if he was born from 1 January 1920 to 10 October 1920.

Other examples:

If now 3 years, year of birth 2020 or 2021
If now 16 years, year of birth 2007 or 2008
If now 27 years, year of birth 1996 or 1997
If now 39 years, year of birth 1984 or 1985

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