66 years old now in 2025 - what year born?

Today, 24 April 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 24 April 1958 until 31 december 1958 inclusively, and his year of birth is 1959 if he was born from 1 January 1959 to 24 April 1959.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 12 years, year of birth 2012 or 2013
If now 19 years, year of birth 2005 or 2006
If now 98 years, year of birth 1926 or 1927

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