42 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 42 years old now, what year was he born? See below:

If 42 years old, year of birth is:
1983 or 1984*

*It depends on whether he was born before or after 1 January 1984.

If now 42 years and his year of birth 1983 if he was born after 28 October 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 28 October 1984.

Other examples:

If now 3 years, year of birth 2022 or 2023
If now 17 years, year of birth 2008 or 2009
If now 23 years, year of birth 2002 or 2003
If now 67 years, year of birth 1958 or 1959

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