87 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 87 years old now, what year was he born? See below:

If 87 years old, year of birth is:
1938 or 1939*

*It depends on whether he was born before or after 1 January 1939.

If now 87 years and his year of birth 1938 if he was born after 28 October 1938 until 31 december 1938 inclusively, and his year of birth is 1939 if he was born from 1 January 1939 to 28 October 1939.

Other examples:

If now 4 years, year of birth 2021 or 2022
If now 12 years, year of birth 2013 or 2014
If now 20 years, year of birth 2005 or 2006
If now 84 years, year of birth 1941 or 1942

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