86 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 86 years old now, what year was he born? See below:

If 86 years old, year of birth is:
1939 or 1940*

*It depends on whether he was born before or after 1 January 1940.

If now 86 years and his year of birth 1939 if he was born after 28 October 1939 until 31 december 1939 inclusively, and his year of birth is 1940 if he was born from 1 January 1940 to 28 October 1940.

Other examples:

If now 8 years, year of birth 2017 or 2018
If now 12 years, year of birth 2013 or 2014
If now 27 years, year of birth 1998 or 1999
If now 40 years, year of birth 1985 or 1986

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