66 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 66 years old now, what year was he born? See below:

If 66 years old, year of birth is:
1958 or 1959*

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

If now 66 years and his year of birth 1958 if he was born after 19 December 1958 until 31 december 1958 inclusively, and his year of birth is 1959 if he was born from 1 January 1959 to 19 December 1959.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 17 years, year of birth 2007 or 2008
If now 25 years, year of birth 1999 or 2000
If now 46 years, year of birth 1978 or 1979

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