65 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 65 years old now, what year was he born? See below:

If 65 years old, year of birth is:
1958 or 1959*

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

If now 65 years and his year of birth 1958 if he was born after 12 September 1958 until 31 december 1958 inclusively, and his year of birth is 1959 if he was born from 1 January 1959 to 12 September 1959.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 16 years, year of birth 2007 or 2008
If now 20 years, year of birth 2003 or 2004
If now 36 years, year of birth 1987 or 1988

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