85 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 85 years old now, what year was he born? See below:

If 85 years old, year of birth is:
1939 or 1940*

*It depends on whether he was born before or after 1 January 1940.

If now 85 years and his year of birth 1939 if he was born after 24 April 1939 until 31 december 1939 inclusively, and his year of birth is 1940 if he was born from 1 January 1940 to 24 April 1940.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 15 years, year of birth 2009 or 2010
If now 21 years, year of birth 2003 or 2004
If now 99 years, year of birth 1925 or 1926

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