103 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 103 years old now, what year was he born? See below:

If 103 years old, year of birth is:
1920 or 1921*

*It depends on whether he was born before or after 1 January 1921.

If now 103 years and his year of birth 1920 if he was born after 10 October 1920 until 31 december 1920 inclusively, and his year of birth is 1921 if he was born from 1 January 1921 to 10 October 1921.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 17 years, year of birth 2006 or 2007
If now 28 years, year of birth 1995 or 1996
If now 94 years, year of birth 1929 or 1930

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