103 years old now in 2023 - what year born?

Today, 26 March 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 26 March 1919 until 31 december 1919 inclusively, and his year of birth is 1920 if he was born from 1 January 1920 to 26 March 1920.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 14 years, year of birth 2008 or 2009
If now 18 years, year of birth 2004 or 2005
If now 71 years, year of birth 1951 or 1952

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