60 years old now in 2025 - what year born?

Today, 18 January 2025 if a person is 60 years old now, what year was he born? See below:

If 60 years old, year of birth is:
1964 or 1965*

*It depends on whether he was born before or after 1 January 1965.

If now 60 years and his year of birth 1964 if he was born after 18 January 1964 until 31 december 1964 inclusively, and his year of birth is 1965 if he was born from 1 January 1965 to 18 January 1965.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 16 years, year of birth 2008 or 2009
If now 18 years, year of birth 2006 or 2007
If now 46 years, year of birth 1978 or 1979

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