40 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 40 years old now, what year was he born? See below:

If 40 years old, year of birth is:
1985 or 1986*

*It depends on whether he was born before or after 1 January 1986.

If now 40 years and his year of birth 1985 if he was born after 28 October 1985 until 31 december 1985 inclusively, and his year of birth is 1986 if he was born from 1 January 1986 to 28 October 1986.

Other examples:

If now 6 years, year of birth 2019 or 2020
If now 17 years, year of birth 2008 or 2009
If now 27 years, year of birth 1998 or 1999
If now 70 years, year of birth 1955 or 1956

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