86 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 86 years old now, what year was he born? See below:

If 86 years old, year of birth is:
1937 or 1938*

*It depends on whether he was born before or after 1 January 1938.

If now 86 years and his year of birth 1937 if he was born after 4 December 1937 until 31 december 1937 inclusively, and his year of birth is 1938 if he was born from 1 January 1938 to 4 December 1938.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 16 years, year of birth 2007 or 2008
If now 18 years, year of birth 2005 or 2006
If now 57 years, year of birth 1966 or 1967

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