58 years old now in 2022 - what year born?

Today, 5 December 2022 if a person is 58 years old now, what year was he born? See below:

If 58 years old, year of birth is:
1963 or 1964*

*It depends on whether he was born before or after 1 January 1964.

If now 58 years and his year of birth 1963 if he was born after 5 December 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 5 December 1964.

Other examples:

If now 5 years, year of birth 2016 or 2017
If now 15 years, year of birth 2006 or 2007
If now 27 years, year of birth 1994 or 1995
If now 72 years, year of birth 1949 or 1950

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