Worked at cruise line company many years ago that had some IBM mainframe developers who I think used COBOL as the programming platform. Given my preconceptions

Worked at cruise line company many years ago that had some IBM mainframe developers who I think used COBOL as the programming platform. Given my preconceptions that few engineers had COBOL skills, I assumed that there were making big $'s in this niche market. Found out it was like 50 dollars an hour which was significantly less that I was getting as an enterprise java dev. Asked one of them why the comp was so low and they said its was because there was still allot of graybearded COBOL devs around and fewer opportunities.