65 years old now in 2023 - what year born?

Today, 5 June 2023 if a person is 65 years old now, what year was he born? See below:

If 65 years old, year of birth is:
1957 or 1958*

*It depends on whether he was born before or after 1 January 1958.

If now 65 years and his year of birth 1957 if he was born after 5 June 1957 until 31 december 1957 inclusively, and his year of birth is 1958 if he was born from 1 January 1958 to 5 June 1958.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 15 years, year of birth 2007 or 2008
If now 29 years, year of birth 1993 or 1994
If now 86 years, year of birth 1936 or 1937

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