89 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 89 years old now, what year was he born? See below:

If 89 years old, year of birth is:
1936 or 1937*

*It depends on whether he was born before or after 1 January 1937.

If now 89 years and his year of birth 1936 if he was born after 28 October 1936 until 31 december 1936 inclusively, and his year of birth is 1937 if he was born from 1 January 1937 to 28 October 1937.

Other examples:

If now 3 years, year of birth 2022 or 2023
If now 14 years, year of birth 2011 or 2012
If now 29 years, year of birth 1996 or 1997
If now 40 years, year of birth 1985 or 1986

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