103 years old now in 2023 - what year born?

Today, 7 December 2023 if a person is 103 years old now, what year was he born? See below:

If 103 years old, year of birth is:
1919 or 1920*

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

If now 103 years and his year of birth 1919 if he was born after 7 December 1919 until 31 december 1919 inclusively, and his year of birth is 1920 if he was born from 1 January 1920 to 7 December 1920.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 18 years, year of birth 2004 or 2005
If now 25 years, year of birth 1997 or 1998
If now 56 years, year of birth 1966 or 1967

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