He probably knew COBOL at one point. He used to write in FoxPro for the longest time. He had an old CompuServe email before we got Juno. My first email was tagged on with his Juno account in the late 90s.
How very droll. Most of your COBOL gigs are with insurance companies, local.gov, and banks. OP's dad is going to have a hard time even getting an interview with outfits like that.