58 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 58 years old now, what year was he born? See below:

If 58 years old, year of birth is:
1964 or 1965*

*It depends on whether he was born before or after 1 January 1965.

If now 58 years and his year of birth 1964 if he was born after 22 March 1964 until 31 december 1964 inclusively, and his year of birth is 1965 if he was born from 1 January 1965 to 22 March 1965.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 15 years, year of birth 2007 or 2008
If now 24 years, year of birth 1998 or 1999
If now 55 years, year of birth 1967 or 1968

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