89 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 89 years old now, what year was he born? See below:

If 89 years old, year of birth is:
1935 or 1936*

*It depends on whether he was born before or after 1 January 1936.

If now 89 years and his year of birth 1935 if he was born after 19 December 1935 until 31 december 1935 inclusively, and his year of birth is 1936 if he was born from 1 January 1936 to 19 December 1936.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 16 years, year of birth 2008 or 2009
If now 19 years, year of birth 2005 or 2006
If now 45 years, year of birth 1979 or 1980

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