65 years old now in 2025 - what year born?

Today, 23 January 2025 if a person is 65 years old now, what year was he born? See below:

If 65 years old, year of birth is:
1959 or 1960*

*It depends on whether he was born before or after 1 January 1960.

If now 65 years and his year of birth 1959 if he was born after 23 January 1959 until 31 december 1959 inclusively, and his year of birth is 1960 if he was born from 1 January 1960 to 23 January 1960.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 16 years, year of birth 2008 or 2009
If now 27 years, year of birth 1997 or 1998
If now 45 years, year of birth 1979 or 1980

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