86 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 86 years old now, what year was he born? See below:

If 86 years old, year of birth is:
1938 or 1939*

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

If now 86 years and his year of birth 1938 if he was born after 19 December 1938 until 31 december 1938 inclusively, and his year of birth is 1939 if he was born from 1 January 1939 to 19 December 1939.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 17 years, year of birth 2007 or 2008
If now 23 years, year of birth 2001 or 2002
If now 41 years, year of birth 1983 or 1984

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