93 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 93 years old now, what year was he born? See below:

If 93 years old, year of birth is:
1930 or 1931*

*It depends on whether he was born before or after 1 January 1931.

If now 93 years and his year of birth 1930 if he was born after 15 October 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 15 October 1931.

Other examples:

If now 5 years, year of birth 2018 or 2019
If now 18 years, year of birth 2005 or 2006
If now 27 years, year of birth 1996 or 1997
If now 86 years, year of birth 1937 or 1938

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