47 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 47 years old now, what year was he born? See below:

If 47 years old, year of birth is:
1978 or 1979*

*It depends on whether he was born before or after 1 January 1979.

If now 47 years and his year of birth 1978 if he was born after 28 October 1978 until 31 december 1978 inclusively, and his year of birth is 1979 if he was born from 1 January 1979 to 28 October 1979.

Other examples:

If now 7 years, year of birth 2018 or 2019
If now 17 years, year of birth 2008 or 2009
If now 26 years, year of birth 1999 or 2000
If now 58 years, year of birth 1967 or 1968

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