59 years old now in 2025 - what year born?

Today, 19 March 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 March 1965 until 31 december 1965 inclusively, and his year of birth is 1966 if he was born from 1 January 1966 to 19 March 1966.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 18 years, year of birth 2006 or 2007
If now 18 years, year of birth 2006 or 2007
If now 99 years, year of birth 1925 or 1926

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