104 years old now in 2023 - what year born?

Today, 10 June 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 10 June 1918 until 31 december 1918 inclusively, and his year of birth is 1919 if he was born from 1 January 1919 to 10 June 1919.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 15 years, year of birth 2007 or 2008
If now 28 years, year of birth 1994 or 1995
If now 48 years, year of birth 1974 or 1975

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