39 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 39 years old now, what year was he born? See below:

If 39 years old, year of birth is:
1985 or 1986*

*It depends on whether he was born before or after 1 January 1986.

If now 39 years and his year of birth 1985 if he was born after 24 April 1985 until 31 december 1985 inclusively, and his year of birth is 1986 if he was born from 1 January 1986 to 24 April 1986.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 15 years, year of birth 2009 or 2010
If now 25 years, year of birth 1999 or 2000
If now 45 years, year of birth 1979 or 1980

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