64 years old now in 2023 - what year born?

Today, 26 March 2023 if a person is 64 years old now, what year was he born? See below:

If 64 years old, year of birth is:
1958 or 1959*

*It depends on whether he was born before or after 1 January 1959.

If now 64 years and his year of birth 1958 if he was born after 26 March 1958 until 31 december 1958 inclusively, and his year of birth is 1959 if he was born from 1 January 1959 to 26 March 1959.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 14 years, year of birth 2008 or 2009
If now 25 years, year of birth 1997 or 1998
If now 52 years, year of birth 1970 or 1971

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