59 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 59 years old now, what year was he born? See below:

If 59 years old, year of birth is:
1965 or 1966*

*It depends on whether he was born before or after 1 January 1966.

If now 59 years and his year of birth 1965 if he was born after 19 December 1965 until 31 december 1965 inclusively, and his year of birth is 1966 if he was born from 1 January 1966 to 19 December 1966.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 13 years, year of birth 2011 or 2012
If now 27 years, year of birth 1997 or 1998
If now 34 years, year of birth 1990 or 1991

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