59 years old now in 2023 - what year born?

Today, 27 March 2023 if a person is 59 years old now, what year was he born? See below:

If 59 years old, year of birth is:
1963 or 1964*

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

If now 59 years and his year of birth 1963 if he was born after 27 March 1963 until 31 december 1963 inclusively, and his year of birth is 1964 if he was born from 1 January 1964 to 27 March 1964.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 13 years, year of birth 2009 or 2010
If now 24 years, year of birth 1998 or 1999
If now 56 years, year of birth 1966 or 1967

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