47 years old now in 2022 - what year born?

Today, 1 October 2022 if a person is 47 years old now, what year was he born? See below:

If 47 years old, year of birth is:
1974 or 1975*

*It depends on whether he was born before or after 1 January 1975.

If now 47 years and his year of birth 1974 if he was born after 1 October 1974 until 31 december 1974 inclusively, and his year of birth is 1975 if he was born from 1 January 1975 to 1 October 1975.

Other examples:

If now 8 years, year of birth 2013 or 2014
If now 12 years, year of birth 2009 or 2010
If now 28 years, year of birth 1993 or 1994
If now 58 years, year of birth 1963 or 1964

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