COBOL legacy systems in finance and government are somewhat of a meme. However, I've never actually met a single person who's day job is to maintain one. I'd be curious to learn what systems are you working on?
Apropos of nothing in particular, there's an older HN thread about "Good resources for learning COBOL" that some folks here might find interesting. OK, calling it a "thread" is over-stating things, but still...