premise: Dr. Michael (Mike) Derrington Murphy (born July 19, 1940) is a chemistry professor, bluegrass musician, and educator who founded the "Bama Bluegrass" Show in 1983. "Bama Bluegrass" is the first and longest running bluegrass show on Alabama public radio.
hypothesis: Dr. Michael (Mike) Derrington Murphy is more than 60 years old.
reason: It's definitely correct because if he was born in 1940 then he has to be over 60 years old. I don't think the system understands how to manipulate ages very well so it doesn't understand how to use the birth years to generate age values.