39 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 39 years old now, what year was he born? See below:

If 39 years old, year of birth is:
1986 or 1987*

*It depends on whether he was born before or after 1 January 1987.

If now 39 years and his year of birth 1986 if he was born after 28 October 1986 until 31 december 1986 inclusively, and his year of birth is 1987 if he was born from 1 January 1987 to 28 October 1987.

Other examples:

If now 6 years, year of birth 2019 or 2020
If now 15 years, year of birth 2010 or 2011
If now 29 years, year of birth 1996 or 1997
If now 74 years, year of birth 1951 or 1952

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