65 years old now in 2023 - what year born?

Today, 7 December 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 7 December 1957 until 31 december 1957 inclusively, and his year of birth is 1958 if he was born from 1 January 1958 to 7 December 1958.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 16 years, year of birth 2006 or 2007
If now 26 years, year of birth 1996 or 1997
If now 72 years, year of birth 1950 or 1951

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