104 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 104 years old now, what year was he born? See below:

If 104 years old, year of birth is:
1918 or 1919*

*It depends on whether he was born before or after 1 January 1919.

If now 104 years and his year of birth 1918 if he was born after 7 December 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 7 December 1919.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 14 years, year of birth 2008 or 2009
If now 27 years, year of birth 1995 or 1996
If now 87 years, year of birth 1935 or 1936

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