89 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 89 years old now, what year was he born? See below:

If 89 years old, year of birth is:
1934 or 1935*

*It depends on whether he was born before or after 1 January 1935.

If now 89 years and his year of birth 1934 if he was born after 15 October 1934 until 31 december 1934 inclusively, and his year of birth is 1935 if he was born from 1 January 1935 to 15 October 1935.

Other examples:

If now 7 years, year of birth 2016 or 2017
If now 13 years, year of birth 2010 or 2011
If now 19 years, year of birth 2004 or 2005
If now 39 years, year of birth 1984 or 1985

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